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Using the 93LC56 and 93LC66
AN560
Using the 93LC56 and 93LC66
INTRODUCTION
The Microchip Technology Inc. 93LC56/66 are lowpower 3-wire non-volatile memories and are suitable for many embedded system code and data storage applications. These devices are easily interfaced to most microcontrollers in today's market place, but Microchip's 8-bit RISC series PIC16CXX offers the best code density of any microcontroller on the market today. Using the PIC16C54, the assembly programs contained in this application note have been fully tested and provide the correct timing and 3-wire sequences to fully operate the 93LC56/66 in a PIC16CXX-based embedded application. The PIC16C54 was clocked at a 10MHz frequency. This application note is intended to provide the engineer with readily available stand-alone code modules to accomplish all of the necessary functions to utilize these devices in a low power application using the efficient PIC16C54 microcontroller. The 93 series of devices have essentially four I/O pins: CS CLK DI DO Chip Select Clock Data In Data Out
3-Wire Byte Write Program
- Delay Routine - Start Bit Routine - Bit Out Routine - Transmit Data Routine - Power-up Routine - Erase/Write Enable Routine (EWEN) - Byte Write Routine - Erase/Write Disable Routine (EWDS)
3-Wire Byte Write with Data Polling Program
- Data Polling Delay Routine - Start Bit Routine - Bit Out Routine - Transmit Data Routine - Power-up Routine - Erase/Write Enable Routine - Write Routine - Erase/Write Disable Routine (EWDS)
This series of devices use a series of commands to accomplish the normal memory functions. These are READ, WRITE, EWEN, ERASE, ERAL, WRAL, EWDS. For a more detailed discussion of the function of these devices reference the appropriate data sheet and AN536, also published by Microchip Technology. The following programs are included in this application note and are fully functional stand-alone modules. They are intended for use by those who are not already familiar with interfacing a PIC16CXX microcontroller to a 93 series device. For those with more experience, please refer to application note AN530.
3-Wire Sequential Read Program
- Delay Routine - Start Bit Routine - Bit In Routine - Receive Data Routine - Bit Out Routine - Transmit Data Routine - Power-up Routine - Read Routine
8
3-Wire Byte Read Program
- Start Bit Routine - Receive Data Routine - Bit Out Routine - Transmit Data Routine - Power-up Routine - Read Routine
Author:
Bruce Negley Memory Products Division
(c) 1994 Microchip Technology Inc.
DS00560D-page 1
8-99
Using the 93LC56 and 93LC66
16c5x/7x Cross-Assembler V4.12 Released Line 0001 0002 0003 0004 0005 0006 0007 0008 0009 0010 0011 0012 0013 0014 0015 0016 0017 0018 0019 0020 0021 0022 0023 0024 0025 0026 0027 0028 0029 0030 0031 0032 0033 0034 0035 0036 0037 0038 0039 0040 0041 0042 0043 0044 0045 0046 0047 0048 0049 0050 0051 PC Opcode LIST P=16C54,c=132 ;**************************************************************** ; 3-Wire Byte Read Program (80 bytes) ; ; This program demonstrates how to interface a ; Microchip PIC16C54 to a 93LC56 or 93LC66 Serial EE ; device. This program will read 8 consecutive addresses ; in the `random read' mode. This means that the opcode ; and address for each byte will be sent to the device. ; This program will repeat forever. ; ; Another, more efficient method of reading consecutive ; addresses is called the `sequential read' mode. This ; involves sending the opcode and address for the first ; byte to read, then continuing to provide clocks for the ; next addresses. The device will automatically increment ; the address. An example of the sequential read mode is ; provided in the `3wseqr.asm' file. ; ; This program communicates to the serial EE in the ; x16 mode, and ASSUMES THE USER HAS SET THE ORG PIN ; ON THE DEVICE TO Vcc. ; ; Timing is based on using the PIC16C54 in `XT' mode ; using a 4Mhz crystal. Clock speeds to the serial EE ; will be approximately 50 kHz for this setup. ; ; PIC16C54 to Serial EE Connections: ; ; PIC16C54 Serial EE ; ------------ ------------ ; Pin 10 (RB4) --> Chip Select ; Pin 11 (RB5) --> Clock ; Pin 12 (RB6) --> Data In ; Pin 13 (RB7) --> Data Out ; ORG = Vcc ; ;************************************************************ ; Register Assignments ;************************************************************ status equ 3h ; status register port_a equ 5h ; port 5 (port_a) port_b equ 6h ; port 6 (port b) comm lines to serial EE eeprom equ 0ah ; bit buffer addr equ 0ch ; address register datai equ 0dh ; stored data input reg. datao equ 0eh ; stored data output reg. txbuf equ 10h ; transmit buffer count equ 11h ; bits transmitted so far bits equ 12h ; bits to transmit bytcnt equ 13h ; byte counter for read routine Mon Jun 06 10:49:10 1994 Page 2 Mon Jun 06 10:49:10 1994 Page 1
0003 0005 0006 000A 000C 000D 000E 0010 0011 0012 0013
16c5x/7x Cross-Assembler V4.12 Released Line 0052 0053 0054 0055 0056 0057 0058 0059 0060 PC Opcode 0015 0016 0017 0018
0007 0006
loops equ 15h ; delay loop counter loops2 equ 16h ; delay loop counter hbyte equ 17h ; high byte for input data lbyte equ 18h ; low byte for input data ;************************************************************ ; Bit Assignments ;************************************************************ di equ 7 ; eeprom input do equ 6 ; eeprom output
DS00560D-page 2
(c) 1994 Microchip Technology Inc.
8-100
Using the 93LC56 and 93LC66
0061 0062 0063 0064 0065 0066 0067 0068 0069 0070 0071 0072 0073 0074 0075 0076 0077 0078 0079 0080 0081 0082 0083 0084 0085 0086 0087 0088 0089 0090 0091 0092 0093 0094 0095 0096 0097 0098 0099 0100 0101 0102 0007 0006 0005 0004 datout equ 7 ; data out line (port_b) datin equ 6 ; data in line (port_b) sclk equ 5 ; clock line (port_b) chpsel equ 4 ; chip select line (port_b) ; ;************************************************************* org 01ffh begin goto PWRUP ; set the reset vector org 000h goto PWRUP ; ;************************************************************** ; Start Bit Subroutine ; this routine generates a start bit ; (Chip select and DI high when clock goes high) ;************************************************************** BSTART bcf port_b,datin ; set datain and chipselect lines bcf port_b,chpsel ; low just to check operation bcf port_b,sclk ; make sure clock starts low too. nop ; bsf port_b,chpsel ; set chip select line high bsf port_b,datin ; set data in line high nop bsf port_b,sclk ; set the clock line high to ; generate the start bit nop nop bcf port_b,sclk ; set clock low again retlw 0 ; ;************************************************************** ; BITIN routine reads one bit of data from the ; serial EE device and stores it in `di' ;************************************************************** BITIN bsf eeprom,di ; assume input bit is high bsf port_b,sclk ; set clock line high nop ; btfss port_b,datout ; read the data bit bcf eeprom,di ; input bit was low Mon Jun 06 10:49:10 1994 Page 3
01FF 0000
0000 0A33 0000 0A33
0001 0002 0003 0004 0005 0006 0007 0008 0009 000A 000B 000C
04C6 0486 04A6 0000 0586 05C6 0000 05A6 0000 0000 04A6 0800
000D 000E 000F 0010 0011
05EA 05A6 0000 07E6 04EA
16c5x/7x Cross-Assembler V4.12 Released Line 0103 0104 0105 0106 0107 0108 0109 0110 0111 0112 0113 0114 0115 0116 0117 0118 0119 0120 0121 0122 0123 0124 PC 0012 0013 Opcode 04A6 0800 bcf retlw
port_b,sclk 0
; set clock line low ; ;
8
0014 0015 0016 0017 0018 0019 001A 001B 001C 001D 001E 001F
006D 0C08 0031 0403 036D 090D 040D 06EA 050D 02F1 0A18 0800
;**************************************************************** ; Receive data routine ; This routine reads one byte of data from the part ; into the `datai' register. ;**************************************************************** RX clrf datai ; clear input buffer movlw .8 ; set # bits to 8 movwf count bcf status,0 ; make sure carry bit is low RXLP rlf datai ; rotate the buffer left 1 bit call BITIN ; read 1 bit bcf datai,0 ; assume the input bit was low btfsc eeprom,di ; check the bit bsf datai,0 ; set high if neccessary decfsz count ; 8 bits done? goto RXLP ; no, do another retlw 0
(c) 1994 Microchip Technology Inc.
DS00560D-page 3
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Using the 93LC56 and 93LC66
0125 0126 0127 0128 0129 0130 0131 0132 0133 0134 0135 0136 0137 0138 0139 0140 0141 0142 0143 0144 0145 0146 0147 0148 0149 0150 0151 0152 0153 ; ;************************************************************* ; BITOUT routine ; This routine takes one bit of data in `do' and ; transmits it to the serial EE device ;************************************************************* BITOUT btfss eeprom,do ; check state of data bit goto bitlow ; low, goto bitlow bsf port_b,datin ; high, set datain high goto clkout ; and clock it ; bitlow bcf port_b,datin ; output a logic low clkout bsf port_b,sclk ; set clock line high nop bcf port_b,sclk ; return clock line low retlw 0 ; ;**************************************************************** ; Transmit Data Subroutine ; This routine takes the byte of data stored in the ; `datao' register and transmits it to the serial EE device. ;**************************************************************** TX movf bits,w ; set the number of bits to xmit movwf count ; TXLP bcf eeprom,do ; assume bit 7 is low Mon Jun 06 10:49:10 1994 Page 4
0020 0021 0022 0023 0024 0025 0026 0027 0028
07CA 0A24 05C6 0A25 04C6 05A6 0000 04A6 0800
0029 002A
0212 0031
002B
04CA
16c5x/7x Cross-Assembler V4.12 Released Line 0154 0155 0156 0157 0158 0159 0160 0161 0162 0163 0164 0165 0166 0167 0168 0169 0170 0171 0172 0173 0174 0175 0176 0177 0178 0179 0180 0181 0182 0183 0184 0185 0186 0187 0188 PC 002C 002D 002E 002F 0030 0031 0032 Opcode 06F0 05CA 0920 0370 02F1 0A2B 0800 btfsc bsf call rlf decfsz goto retlw
txbuf,7 eeprom,do BITOUT txbuf count TXLP 0
; ; ; ; ; ; ;
is bit 7 clear? no, set data bit =1 transmit 1 bit to serial EE rotate txbuf left all bits done? no, do another bit yes, jump out
0033 0034 0035 0036 0037
0C00 0005 0065 0C80 0006
; ;**************************************************************** ; POWER-UP ROUTINE ; This is the program entry point, which in this case simply ; sets the port_a I/O lines and directs control to the ; read routine. ;***************************************************************** PWRUP ; movlw b'00000000' tris port_a ; set port_a as all output clrf port_a ; all lines low movlw tris b'10000000' port_b
0038 0039
0C00 002C
; set RB7 as input, rest output; ; ; Fall through and do the read ; ;********************************************************************* ; READ ROUTINE ; This routine reads 8 consecutive addresses in ; random mode starting at address 0. This is done in ; x16 mode and will repeat forever. ;********************************************************************* READ ; movlw .0 ; set starting address to 00 movwf addr ;
DS00560D-page 4
(c) 1994 Microchip Technology Inc.
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Using the 93LC56 and 93LC66
0189 0190 0191 0192 0193 0194 0195 0196 0197 0198 0199 0200 0201 0202 0203 0204 003A 003B 003C 003D 003E 003F 0040 0041 0042 0043 0044 0045 0046 0047 0C08 0033 0901 0C02 0032 0C80 0030 0929 0C08 0032 020C 0030 0929 0914 rbyte movlw movwf call movlw movwf movlw movwf call movlw movwf movf movwf call call .8 bytcnt BSTART .2 bits b'10000000' txbuf TX .8 bits addr,w txbuf TX RX ; ; ; ; ; ; ; ; ; ; ; ; ; ; set number of addresses to read as 8 generate the start bit set # bits to 2 get opcode (10b) into output buffer and transmit it set number of bits to 8 get the address into the output buffer and transmit it
; read the high byte Mon Jun 06 10:49:10 1994 Page 5
16c5x/7x Cross-Assembler V4.12 Released Line 0205 0206 0207 0208 0209 0210 0211 0212 0213 0214 0215 0216 0217 0218 PC 0048 0049 004A 004B 004C 004D 004E 004F 0050 0051 Opcode 020D 0037 0914 020D 0037 0486 02AC 02F3 0A3C 0A38 0000 movf movwf call movf movwf bcf incf decfsz goto goto END
datai,w hbyte RX datai,w hbyte port_b,chpsel addr bytcnt rbyte READ
; move input data to w ; xfer it to high byte ; read the low byte ; move input data to w ; xfer it to low byte ; clear the chip select line ; ; ; ; add 1 to the address have all bytes been read? no, read another byte yes, start over
8
(c) 1994 Microchip Technology Inc.
DS00560D-page 5
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Using the 93LC56 and 93LC66
16c5x/7x Cross-Assembler V4.12 Released Line 0001 0002 0003 0004 0005 0006 0007 0008 0009 0010 0011 0012 0013 0014 0015 0016 0017 0018 0019 0020 0021 0022 0023 0024 0025 0026 0027 0028 0029 0030 0031 0032 0033 0034 0035 0036 0037 0038 0039 0040 0041 0042 0043 0044 0045 0046 0047 0048 0049 0050 0051 PC Opcode LIST P=16C54,c=132 ;**************************************************************** ; 3-Wire Byte Write Program (106 bytes) ; ; This program demonstrates how to interface a ; Microchip PIC16C54 to a 93LC56 or 93LC66 Serial EE ; device. This program will execute the erase/write enable ; command, write to 8 consecutive addresses, and then ; execute the erase/write disable command. This ; sequence will repeat forever. ; ; After each byte is written, time must be given to the ; device for it to complete the write cycle before ; the next command can be sent. The easiest solution ; is to consult the data book for the maximum write ; cycle time and just wait that long before the next ; command is sent. This program demonstrates that ; solution. ; ; Another, more efficient method of determining when the ; write cycle is complete is called `data polling.' This ; method is demonstrated in the program "3wdpoll." ; ; This program communicates to the serial EE in the ; x16 mode, and ASSUMES THE USER HAS SET THE ORG PIN ; ON THE DEVICE TO Vcc. ; ; Timing is based on using the PIC16C54 in `XT' mode ; using a 4Mhz crystal. Clock speeds to the serial EE ; will be approximately 40 kHz for this setup. ; ; PIC16C54 to Serial EE Connections: ; ; PIC16C54 Serial EE ; ------------ ------------ ; Pin 10 (RB4) --> Chip Select ; Pin 11 (RB5) --> Clock ; Pin 12 (RB6) --> Data In ; Pin 13 (RB7) --> Data Out ; ORG=Vcc ; ;************************************************************ ; Register Assignments ;************************************************************ port_a equ 5h ; port 5 (port_a) port_b equ 6h ; port 6 (port b) comm lines to serial EE eeprom equ 0ah ; bit buffer addr equ 0ch ; address register datai equ 0dh ; stored data input reg. datao equ 0eh ; stored data output reg. txbuf equ 10h ; transmit buffer Mon Jun 06 10:49:06 1994 Page 2 Mon Jun 06 10:49:06 1994 Page 1
0005 0006 000A 000C 000D 000E 0010
16c5x/7x Cross-Assembler V4.12 Released Line 0052 0053 0054 0055 0056 0057 0058 0059 0060 PC Opcode 0011 0012 0013 0015 0016
0007
count equ 11h ; bits transmitted so far bits equ 12h ; bits to transmit bytcnt equ 13h ; byte counter for write routine loops equ 15h ; delay loop counter loops2 equ 16h ; delay loop counter ; ;************************************************************ ; Bit Assignments ;************************************************************ di equ 7 ; eeprom input
DS00560D-page 6
(c) 1994 Microchip Technology Inc.
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Using the 93LC56 and 93LC66
0061 0062 0063 0064 0065 0066 0067 0068 0069 0070 0071 0072 0073 0074 0075 0076 0077 0078 0079 0080 0081 0082 0083 0084 0085 0086 0087 0088 0089 0090 0091 0092 0093 0094 0095 0096 0097 0098 0099 0100 0101 0102 0006 0007 0006 0005 0004 do equ 6 ; eeprom output datout equ 7 ; data out line (port_b) datin equ 6 ; data in line (port_b) sclk equ 5 ; clock line (port_b) chpsel equ 4 ; chip select line (port_b) ; ;************************************************************* org 01ffh begin goto PWRUP ; set the reset vector org 000h goto PWRUP ; ;************************************************************* ; DELAY ROUTINE ; This routine takes the value in `loops' ; and multiplies it times 1 millisecond to ; determine delay time. ;************************************************************* WAIT ; top movlw .110 ; timing adjustment variable movwf loops2 top2 nop ; sit and wait nop nop nop nop nop decfsz loops2 ; inner loops complete? goto top2 ; no, go again ; decfsz loops ; outer loops complete? goto top ; no, go again retlw 0 ; yes, return from sub ; ;************************************************************** ; Start Bit Subroutine ; this routine generates a start bit ; (Chip select and DI high when clock goes high) ;**************************************************************; BSTART movlw b'10001111' Mon Jun 06 10:49:06 1994 Page 3
01FF 0000
0000 0A2F 0000 0A2F
0001 0002 0003 0004 0005 0006 0007 0008 0009 000A 000B 000C 000D
0C6E 0036 0000 0000 0000 0000 0000 0000 02F6 0A03 02F5 0A01 0800
000E
0C8F
16c5x/7x Cross-Assembler V4.12 Released Line 0103 0104 0105 0106 0107 0108 0109 0110 0111 0112 0113 0114 0115 0116 0117 0118 0119 0120 0121 0122 0123 0124 PC 000F 0010 0011 0012 0013 0014 0015 0016 0017 0018 0019 001A 001B Opcode 0006 04C6 0486 04A6 0000 ; 0586 05C6 0000 05A6 0000 0000 04A6 0800 bsf bsf nop bsf tris bcf bcf bcf nop
port_b port_b,datin port_b,chpsel port_b,sclk
; ; ; ; ;
set port b for output except for the data out line set datain and chipselect lines low just to check operation make sure clock starts low too.
8
port_b,chpsel port_b,datin port_b,sclk
; set chip select line high ; set data in line high ; set the clock line high to ; generate the start bit
nop nop bcf port_b,sclk ; set clock low again retlw 0 ; ;************************************************************* ; BITOUT routine ; This routine takes one bit of data in `do' and ; transmits it to the serial EE device ;*************************************************************
(c) 1994 Microchip Technology Inc.
DS00560D-page 7
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Using the 93LC56 and 93LC66
0125 0126 0127 0128 0129 0130 0131 0132 0133 0134 0135 0136 0137 0138 0139 0140 0141 0142 0143 0144 0145 0146 0147 0148 0149 0150 0151 0152 0153 BITOUT 001C 001D 001E 001F 0020 0021 0022 0023 0024 07CA 0A20 05C6 0A21 04C6 05A6 0000 04A6 0800 bitlow clkout btfss goto bsf goto bcf bsf nop bcf retlw eeprom,do bitlow port_b,datin clkout port_b,datin port_b,sclk port_b,sclk 0 ; ; ; ; ; ; ; check state of data bit low, goto bitlow high, set datain high and clock it output a logic low set clock line high
; return clock line low
0025 0026
0212 0031
0027 0028 0029 002A 002B 002C 002D
04CA 06F0 05CA 091C 0370 02F1 0A27
; ;**************************************************************** ; Transmit Data Subroutine ; This routine takes the byte of data stored in the ; `datao' register and transmits it to the serial EE device. ;**************************************************************** TX movf bits,w ; set the number of bits to xmit movwf count ; TXLP bcf eeprom,do ; assume bit 7 is low btfsc txbuf,7 ; is bit 7 clear? bsf eeprom,do ; no, set data bit =1 call BITOUT ; transmit 1 bit to serial EE rlf txbuf ; rotate txbuf left decfsz count ; all bits done? goto TXLP ; no, do another bit Mon Jun 06 10:49:06 1994 Page 4
16c5x/7x Cross-Assembler V4.12 Released Line 0154 0155 0156 0157 0158 0159 0160 0161 0162 0163 0164 0165 0166 0167 0168 0169 0170 0171 0172 0173 0174 0175 0176 0177 0178 0179 0180 0181 0182 0183 0184 0185 0186 0187 0188 PC 002E Opcode 0800
002F 0030 0031 0032 0033
0C00 0005 0065 0C80 0006
retlw 0 ; yes, jump out ; ;**************************************************************** ; POWER-UP ROUTINE ; This is the program entry point, which in this case simply ; sets the port_a I/O lines and directs control to the ; erase/write enable routine. ;***************************************************************** PWRUP ; movlw b'00000000' tris port_a ; set port_a as all output clrf port_a ; all lines low movlw tris b'10000000' port_b
0034 0035 0036 0037 0038 0039 003A
090E 0C02 0032 0C00 0030 0925 0C08
; set RB7 as input, rest output; ; ; Fall through and do erase/write enable ; ;**************************************************************** ; EWEN (Erase/Write ENable Routine) ; this routine enables the dut for erasing and ; writing. This must be done prior to any erase,write ; eral,wral instructions. ;**************************************************************** EWEN ; call BSTART ; generate a start bit ; movlw .2 ; set # bits to 2 movwf bits ; movlw b'00000000' ; get the opcode (00b) movwf txbuf ; into the output buffer call TX ; and transmit it movlw .8 ; set # bits to 8
DS00560D-page 8
(c) 1994 Microchip Technology Inc.
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Using the 93LC56 and 93LC66
0189 0190 0191 0192 0193 0194 0195 0196 0197 0198 0199 0200 0201 0202 0203 0204 003B 003C 003D 003E 003F 0040 0032 0CC0 0030 0925 0486 0000 movwf movlw movwf call bcf nop bits b'11000000' txbuf TX port_b,chpsel ; ; ; ; ; ; get opcode and address (11XXXXXX) into output buffer and transmit it set chip select line low
; ; Now continue on to the write command ; ;************************************************************** ; Byte Write Routine ; This routine writes an AA55h pattern into ; 8 consecutive addresses starting at address 00. ; A delay of about 10ms is given after each byte ; for the write cycle to complete. Mon Jun 06 10:49:06 1994 Page 5
16c5x/7x Cross-Assembler V4.12 Released Line 0205 0206 0207 0208 0209 0210 0211 0212 0213 0214 0215 0216 0217 0218 0219 0220 0221 0222 0223 0224 0225 0226 0227 0228 0229 0230 0231 0232 0233 0234 0235 0236 0237 0238 0239 0240 0241 0242 0243 0244 0245 0246 0247 0248 0249 0250 0251 0252 PC Opcode
0041 0042 0043 0044 0045 0046 0047 0048 0049 004A 004B 004C 004D 004E 004F 0050 0051 0052 0053 0054 0055 0056
0C00 002C 0C08 0033 090E 0C02 0032 0C40 0030 0925 0C08 0032 020C 0030 0925 0CAA 0030 0925 0C55 0030 0925 0486
0057 0058 0059 005A 005B 005C
0C0A 0035 0901 02AC 02F3 0A45
; The write is done in the x16 mode: the user must ; have the ORG pin tied to Vcc on the device ;**************************************************************** WRITE ; movlw .0 ; set starting address to 00 movwf addr ; movlw .8 ; set number of bytes to write as 8 movwf bytcnt ; ; topwr call BSTART ; generate the start bit ; movlw .2 ; set # bits to 2 for the opcode movwf bits ; movlw b'01000000' ; get opcode (01b) movwf txbuf ; into the transmit buffer call TX ; and send it ; movlw .8 ; set # of bits to 8 for the movwf bits ; address movf addr,w ; get address counter movwf txbuf ; into output buffer call TX ; and send it movlw b'10101010' ; get upper byte of data (AAh) movwf txbuf ; into the transmit buffer call TX ; and send it movlw b'01010101' ; get lower byte of data (55h) movwf txbuf ; into transmit buffer call TX ; and send it ; bcf port_b,chpsel ; clear the chip select line ; to initiate write cycle ; movlw .10 ; movwf loops ; set delay time to 10mS call WAIT ; and wait ; incf addr ; increment address counter decfsz bytcnt ; all bytes written? goto topwr ; no, do another ; yes, go on ; ; Now continue on to the erase/write disable command ; ;**************************************************************** ; EWDS (Erase/Write Disable Routine) ; This routine executes the erase/write disable command ; which prevents the contents of the array from being
8
(c) 1994 Microchip Technology Inc.
DS00560D-page 9
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0253 0254 0255 ; written to. ; ;**************************************************************** Mon Jun 06 10:49:06 1994 Page 6
16c5x/7x Cross-Assembler V4.12 Released Line 0256 0257 0258 0259 0260 0261 0262 0263 0264 0265 0266 0267 0268 0269 0270 0271 0272 0273 0274 0275 PC Opcode EWDS ; 005D 005E 005F 0060 0061 0062 0063 0064 0065 0066 0067 0068 0069 006A 090E ; 0C02 0032 0C00 0030 0925 0C08 0032 0C00 0030 0925 0486 0000 0A34 0000 ; END movlw movwf movlw movwf call movlw movwf movlw movwf call bcf nop goto call
BSTART .2 bits b'00000000' txbuf TX .8 bits b'00000000' txbuf TX port_b,chpsel EWEN
; generate a start bit ; ; ; ; ; ; ; ; ; ; ; ; set # bits to 2 get the opcode (00b) into the output buffer and transmit it set # bits to 8 get opcode and address (00XXXXXX) into output buffer and transmit it set chip select line low
; start all over
DS00560D-page 10
(c) 1994 Microchip Technology Inc.
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16c5x/7x Cross-Assembler V4.12 Released Line 0001 0002 0003 0004 0005 0006 0007 0008 0009 0010 0011 0012 0013 0014 0015 0016 0017 0018 0019 0020 0021 0022 0023 0024 0025 0026 0027 0028 0029 0030 0031 0032 0033 0034 0035 0036 0037 0038 0039 0040 0041 0042 0043 0044 0045 0046 0047 0048 0049 0050 0051 PC Opcode LIST P=16C54,c=132 ;**************************************************************** ; 3-Wire Byte Write with Data Poll Program (107 bytes) ; ; This program demonstrates how to interface a ; Microchip PIC16C54 to a 93LC56 or 93LC66 Serial EE ; device. This program will execute the erase/write enable ; command, write to 8 consecutive addresses, and then ; use the `data polling' method to determine when the ; write cycle is complete. The program then executes ; the erase/write disable command. This sequence will ; repeat forever. ; ; When writing to a 3-wire serial EE device, the ; internally timed write cycle will begin after ; the opcode, address and data are sent to the ; device. There are two ways to make sure that the ; cycle is complete before you send it another command. ; The simplest method is to simply wait for the maximum ; write cycle time, which can be obtained from the data book. ; A more efficient method is "Data polling." This is ; done by toggling the chip select line low and then ; back high after the opcode, address and data are sent. ; The chip select line must be low for at least 250ns ; before bringing it high again. The device will pull ; the data out line low at that point, and set it high ; when the write cycle is complete. The user can then check ; or "poll" the dataout line until it goes high before ; sending the next command. ; ; As an option, the user can connect a LED to pin 18 ; on the PIC16C54 (use about a 1K resistor in series) as a ; timeout indicator. This LED will come on if the ; data polling is unsuccessful and the device being ; programmed does not respond. This can be tested by ; simply running the program with no part in the socket. ; ; This program communicates to the serial EE in the ; x16 mode, and ASSUMES THE USER HAS SET THE ORG PIN ; ON THE DEVICE TO Vcc. ; ; Timing is based on using the PIC16C54 in `XT' mode ; using a 4Mhz crystal. Clock speeds to the serial EE ; will be approximately 50 kHz for this setup. ; ; PIC16C54 to Serial EE Connections: ; ; PIC16C54 Serial EE ; ------------ ------------ ; Pin 10 (RB4) --> Chip Select ; Pin 11 (RB5) --> Clock Mon Jun 06 10:49:00 1994 Page 2 Mon Jun 06 10:49:00 1994 Page 1
8
16c5x/7x Cross-Assembler V4.12 Released Line 0052 0053 0054 0055 0056 0057 0058 0059 0060 PC Opcode
0005 0006
; Pin 12 (RB6) --> Data In ; Pin 13 (RB7) --> Data Out ; ORG=Vcc ; ;************************************************************ ; Register Assignments ;************************************************************ port_a equ 5h ; port 5 (port_a) port_b equ 6h ; port 6 (port b) used comm lines to serial EE
(c) 1994 Microchip Technology Inc.
DS00560D-page 11
8-109
Using the 93LC56 and 93LC66
0061 0062 0063 0064 0065 0066 0067 0068 0069 0070 0071 0072 0073 0074 0075 0076 0077 0078 0079 0080 0081 0082 0083 0084 0085 0086 0087 0088 0089 0090 0091 0092 0093 0094 0095 0096 0097 0098 0099 0100 0101 0102 000A 000C 000D 000E 0010 0011 0012 0013 0015 0016 eeprom equ 0ah ; bit buffer addr equ 0ch ; address register datai equ 0dh ; stored data input reg. datao equ 0eh ; stored data output reg. txbuf equ 10h ; transmit buffer count equ 11h ; bits transmitted so far bits equ 12h ; bits to transmit bytcnt equ 13h ; byte counter for write routine loops equ 15h ; delay loop counter loops2 equ 16h ; delay loop counter ;************************************************************ ; Bit Assignments ;************************************************************ di equ 7 ; eeprom input do equ 6 ; eeprom output datout equ 7 ; data out line (port_b) datin equ 6 ; data in line (port_b) sclk equ 5 ; clock line (port_b) chpsel equ 4 ; chip select line (port_b) timeout equ 1 ; write cycle timeout warning (port_a) ; ;************************************************************* org 01ffh begin goto PWRUP ; set the reset vector org 000h goto PWRUP ; ;************************************************************* ; DATA POLL DELAY ROUTINE ; This routine delays 100 us is ; used for delay between polls ;************************************************************* dpdelay ; movlw .25 ; timing adjustment variable movwf loops2 top nop decfsz loops2 ; loops complete? goto top ; no, go again ; retlw 0 ; yes, return from sub ; Mon Jun 06 10:49:00 1994 Page 3
0007 0006 0007 0006 0005 0004 0001
01FF 0000
0000 0A26 0000 0A26
0001 0002 0003 0004 0005 0006
0C19 0036 0000 02F6 0A03 0800
16c5x/7x Cross-Assembler V4.12 Released Line 0103 0104 0105 0106 0107 0108 0109 0110 0111 0112 0113 0114 0115 0116 0117 0118 0119 0120 0121 0122 0123 0124 PC Opcode
0007 0008 0009 000A 000B 000C 000D 000E 000F 0010 0011 0012
04C6 0486 04A6 0000 0586 05C6 0000 05A6 0000 0000 04A6 0800
;************************************************************** ; Start Bit Subroutine ; this routine generates a start bit ; (Chip select and DI high when clock goes high) ;**************************************************************; BSTART bcf port_b,datin ; set datain and chipselect lines bcf port_b,chpsel ; low just to check operation bcf port_b,sclk ; make sure clock starts low too. nop ; bsf port_b,chpsel ; set chip select line high bsf port_b,datin ; set data in line high nop bsf port_b,sclk ; set the clock line high to ; generate the start bit nop nop bcf port_b,sclk ; set clock low again retlw 0 ; ;*************************************************************
DS00560D-page 12
(c) 1994 Microchip Technology Inc.
8-110
Using the 93LC56 and 93LC66
0125 0126 0127 0128 0129 0130 0131 0132 0133 0134 0135 0136 0137 0138 0139 0140 0141 0142 0143 0144 0145 0146 0147 0148 0149 0150 0151 0152 0153 ; BITOUT routine ; This routine takes one bit of data in `do' and ; transmits it to the serial EE device ;************************************************************* BITOUT btfss eeprom,do ; check state of data bit goto bitlow ; low, goto bitlow bsf port_b,datin ; high, set datain high goto clkout ; and clock it ; bitlow bcf port_b,datin ; output a logic low clkout bsf port_b,sclk ; set clock line high nop bcf port_b,sclk ; return clock line low retlw 0 ; ;**************************************************************** ; Transmit Data Subroutine ; This routine takes the byte of data stored in the ; `datao' register and transmits it to the serial EE device. ;**************************************************************** TX movf bits,w ; set the number of bits to xmit movwf count ; TXLP bcf eeprom,do ; assume bit 7 is low btfsc txbuf,7 ; is bit 7 clear? bsf eeprom,do ; no, set data bit =1 Mon Jun 06 10:49:00 1994 Page 4
0013 0014 0015 0016 0017 0018 0019 001A 001B
07CA 0A17 05C6 0A18 04C6 05A6 0000 04A6 0800
001C 001D
0212 0031
001E 001F 0020
04CA 06F0 05CA
16c5x/7x Cross-Assembler V4.12 Released Line 0154 0155 0156 0157 0158 0159 0160 0161 0162 0163 0164 0165 0166 0167 0168 0169 0170 0171 0172 0173 0174 0175 0176 0177 0178 0179 0180 0181 0182 0183 0184 0185 0186 0187 0188 PC 0021 0022 0023 0024 0025 Opcode 0913 0370 02F1 0A1E 0800 call rlf decfsz goto retlw
BITOUT txbuf count TXLP 0
; ; ; ; ;
transmit 1 bit to serial EE rotate txbuf left all bits done? no, do another bit yes, jump out
0026 0027 0028 0029 002A
0C00 0005 0065 0C80 0006
; ;**************************************************************** ; POWER-UP ROUTINE ; This is the program entry point, which in this case simply ; sets the port_a I/O lines and directs control to the ; erase/write enable routine. ;***************************************************************** PWRUP ; movlw b'00000000' tris port_a ; set port_a as all output clrf port_a ; all lines low movlw tris b'10000000' port_b
8
002B 002C 002D
0907 0C02 0032
; set RB7 as input, rest output; ; ; Fall through and do erase/write enable ; ;**************************************************************** ; EWEN (Erase/Write ENable Routine) ; this routine enables the dut for erasing and ; writing. This must be done prior to any erase,write ; eral,wral instructions. ;**************************************************************** EWEN ; call BSTART ; generate a start bit ; movlw .2 ; set # bits to 2 movwf bits ;
(c) 1994 Microchip Technology Inc.
DS00560D-page 13
8-111
Using the 93LC56 and 93LC66
0189 0190 0191 0192 0193 0194 0195 0196 0197 0198 0199 0200 0201 0202 0203 0204 002E 002F 0030 0031 0032 0033 0034 0035 0036 0037 0C00 0030 091C 0C08 0032 0CC0 0030 091C 0486 0000 movlw movwf call movlw movwf movlw movwf call bcf nop b'00000000' txbuf TX .8 bits b'11000000' txbuf TX port_b,chpsel ; ; ; ; ; ; ; ; ; ; get the opcode (00b) into the output buffer and transmit it set # bits to 8 get opcode and address (11XXXXXX) into output buffer and transmit it set chip select line low
; ; Now continue on to the write command ; ;************************************************************** ; WRITE Mon Jun 06 10:49:00 1994 Page 5
16c5x/7x Cross-Assembler V4.12 Released Line 0205 0206 0207 0208 0209 0210 0211 0212 0213 0214 0215 0216 0217 0218 0219 0220 0221 0222 0223 0224 0225 0226 0227 0228 0229 0230 0231 0232 0233 0234 0235 0236 0237 0238 0239 0240 0241 0242 0243 0244 0245 0246 0247 0248 0249 0250 0251 0252 PC Opcode
0038 0039 003A 003B 003C 003D 003E 003F 0040 0041 0042 0043 0044 0045 0046 0047 0048 0049 004A 004B 004C 004D 004E 004F 0050 0051 0052 0053 0054 0055
0C00 002C 0C08 0033 0907 0C02 0032 0C40 0030 091C 0C08 0032 020C 0030 091C 0CAA 0030 091C 0C55 0030 091C 0486 0000 0586 0CC8 0035 0901 06E6 0A59 02F5
; This routine writes a AA55h pattern into ; 8 consecutive addresses starting at address 00. ; It will then `poll' the data out line to determine ; when the write cycle is complete. If the cycle has ; not completed within 20 ms, then it will continue ; anyway and turn the timeout fail LED on. ; The write is done in the x16 mode: the user must ; have the ORG pin tied to Vcc on the device. This ; program will repeat forever. ;**************************************************************** WRITE ; movlw .0 ; set starting address to 00 movwf addr ; movlw .8 ; set number of bytes to write as 8 movwf bytcnt ; ; topwr call BSTART ; generate the start bit ; movlw .2 ; set # bits to 2 for the opcode movwf bits ; movlw b'01000000' ; get opcode (01b) movwf txbuf ; into the transmit buffer call TX ; and send it ; movlw .8 ; set # of bits to 8 for the movwf bits ; address movf addr,w ; get address counter movwf txbuf ; into output buffer call TX ; and send it movlw b'10101010' ; get first half of data (AAh) movwf txbuf ; into the transmit buffer call TX ; and send it movlw b'01010101' ; get second half of data (55h) movwf txbuf ; into transmit buffer call TX ; and send it ; bcf port_b,chpsel ; clear the chip select line ; to initiate write cycle nop bsf port_b,chpsel ; set the chip sel line high ; to begin data polling movlw .200 ; movwf loops ; poll 100 times before timeout(about 20ms) polltop call dpdelay ; wait 100us btfsc port_b,datout ; is the data out line high? goto okpoll ; yes-cycle complete: do another decfsz loops ; has it timed out?
DS00560D-page 14
(c) 1994 Microchip Technology Inc.
8-112
Using the 93LC56 and 93LC66
0253 0254 0255 0056 0057 0058 0A52 0525 0A5A goto bsf goto polltop ; no, check again port_a,timeout; yes, set timeout LED and go on badpoll ; Mon Jun 06 10:49:00 1994 Page 6
16c5x/7x Cross-Assembler V4.12 Released Line 0256 0257 0258 0259 0260 0261 0262 0263 0264 0265 0266 0267 0268 0269 0270 0271 0272 0273 0274 0275 0276 0277 0278 0279 0280 0281 0282 0283 0284 0285 0286 0287 0288 0289 0290 0291 0292 0293 0294 PC Opcode
0059 005A 005B 005C 005D
0425 0486 02AC 02F3 0A3C
okpoll badpoll
bcf bcf incf decfsz goto
port_a,timeout; port_b,chpsel ; addr ; bytcnt ; topwr ; ;
clear the timeout LED chip sel line back low increment address counter all bytes written? no, do another yes, go on
005E 005F 0060 0061 0062 0063 0064 0065 0066 0067 0068 0069 006A 006B
0907 0C02 0032 0C00 0030 091C 0C08 0032 0C00 0030 091C 0486 0000 0A2B
; ; Now continue on to the erase/write disable command ; ;**************************************************************** ; EWDS (Erase/Write Disable Routine) ; This routine executes the erase/write disable command ; which prevents the contents of the array from being ; written to. ; ;**************************************************************** EWDS ; call BSTART ; generate a start bit ; movlw .2 ; set # bits to 2 movwf bits ; movlw b'00000000' ; get the opcode (00b) movwf txbuf ; into the output buffer call TX ; and transmit it movlw .8 ; set # bits to 8 movwf bits ; movlw b'00000000' ; get opcode and address ; (00XXXXXX) movwf txbuf ; into output buffer call TX ; and transmit it bcf port_b,chpsel ; set chip select line low nop goto EWEN ; start all over ; ; END
0000
8
(c) 1994 Microchip Technology Inc.
DS00560D-page 15
8-113
Using the 93LC56 and 93LC66
16c5x/7x Cross-Assembler V4.12 Released Line 0001 0002 0003 0004 0005 0006 0007 0008 0009 0010 0011 0012 0013 0014 0015 0016 0017 0018 0019 0020 0021 0022 0023 0024 0025 0026 0027 0028 0029 0030 0031 0032 0033 0034 0035 0036 0037 0038 0039 0040 0041 0042 0043 0044 0045 0046 0047 0048 0049 0050 0051 PC Opcode LIST P=16C54,c=132 ;**************************************************************** ; 3-Wire Sequential Read Program (93 bytes) ; ; This program demonstrates how to interface a ; Microchip PIC16C54 to a 93LC56 or 93LC66 Serial EE ; device. This program will read 8 consecutive addresses ; in the `sequential read' mode. This means that the opcode ; and address are sent for the first address only. After ; the first address is read, the Chip Select line is left ; high and clocks for the remaining 7 bytes are sent to the ; device. The device will automatically increment the address ; pointer in this mode, allowing the user to read as many ; consecutive addresses as needed. This program will repeat ; forever. ; ; This program communicates to the serial EE in the ; x16 mode, and ASSUMES THE USER HAS SET THE ORG PIN ; ON THE DEVICE TO Vcc. ; ; Timing is based on using the PIC16C54 in `XT' mode ; using a 4MHz crystal. Clock speeds to the serial EE ; will be approximately 50 kHz for this setup. ; ; PIC16C54 to Serial EE Connections: ; ; PIC16C54 Serial EE ; ------------ ------------ ; Pin 10 (RB4) --> Chip Select ; Pin 11 (RB5) --> Clock ; Pin 12 (RB6) --> Data In ; Pin 13 (RB7) --> Data Out ; ORG = Vcc ; ;************************************************************ ; Register Assignments ;************************************************************ status equ 3h ; status register port_a equ 5h ; port 5 (port_a) port_b equ 6h ; port 6 (port b) used comm lines to serial EE eeprom equ 0ah ; bit buffer addr equ 0ch ; address register datai equ 0dh ; stored data input reg. datao equ 0eh ; stored data output reg. txbuf equ 10h ; transmit buffer count equ 11h ; bits transmitted so far bits equ 12h ; bits to transmit bytcnt equ 13h ; byte counter for read routine loops equ 15h ; delay loop counter loops2 equ 16h ; delay loop counter hbyte equ 17h ; high byte for input data Mon Jun 06 10:49:20 1994 Page 2 Mon Jun 06 10:49:20 1994 Page 1
0003 0005 0006 000A 000C 000D 000E 0010 0011 0012 0013 0015 0016 0017
16c5x/7x Cross-Assembler V4.12 Released Line 0052 0053 0054 0055 0056 0057 0058 0059 0060 PC Opcode 0018
0007 0006 0007 0006 0005
lbyte equ 18h ; low byte for input data ;************************************************************ ; Bit Assignments ;************************************************************ di equ 7 ; eeprom input do equ 6 ; eeprom output datout equ 7 ; data out line (port_b) datin equ 6 ; data in line (port_b) sclk equ 5 ; clock line (port_b)
DS00560D-page 16
(c) 1994 Microchip Technology Inc.
8-114
Using the 93LC56 and 93LC66
0061 0062 0063 0064 0065 0066 0067 0068 0069 0070 0071 0072 0073 0074 0075 0076 0077 0078 0079 0080 0081 0082 0083 0084 0085 0086 0087 0088 0089 0090 0091 0092 0093 0094 0095 0096 0097 0098 0099 0100 0101 0102 0004 chpsel equ 4 ; chip select line (port_b) ; ;************************************************************* org 01ffh begin goto PWRUP ; set the reset vector org 000h goto PWRUP ; ;************************************************************* ; DELAY ROUTINE ; This routine takes the value in `loops' ; and multiplies it times 1 millisecond to ; determine delay time. ;************************************************************* WAIT ; top movlw .110 ; timing adjustment variable movwf loops2 top2 nop ; sit and wait nop nop nop nop nop decfsz loops2 ; inner loops complete? goto top2 ; no, go again ; decfsz loops ; outer loops complete? goto top ; no, go again retlw 0 ; yes, return from sub ; ;************************************************************** ; Start Bit Subroutine ; this routine generates a start bit ; (Chip select and DI high when clock goes high) ;************************************************************** BSTART bcf port_b,datin ; set datain and chipselect lines bcf port_b,chpsel ; low just to check operation bcf port_b,sclk ; make sure clock starts low too. nop ; Mon Jun 06 10:49:20 1994 Page 3
01FF 0000
0000 0A40 0000 0A40
0001 0002 0003 0004 0005 0006 0007 0008 0009 000A 000B 000C 000D
0C6E 0036 0000 0000 0000 0000 0000 0000 02F6 0A03 02F5 0A01 0800
000E 000F 0010 0011
04C6 0486 04A6 0000
16c5x/7x Cross-Assembler V4.12 Released Line 0103 0104 0105 0106 0107 0108 0109 0110 0111 0112 0113 0114 0115 0116 0117 0118 0119 0120 0121 0122 0123 0124 PC 0012 0013 0014 0015 0016 0017 0018 0019 Opcode 0586 05C6 0000 05A6 0000 0000 04A6 0800 bsf bsf nop bsf
port_b,chpsel port_b,datin port_b,sclk
; set chip select line high ; set data in line high ; set the clock line high to ; generate the start bit
8
001A 001B 001C 001D 001E 001F
05EA 05A6 0000 07E6 04EA 04A6
nop nop bcf port_b,sclk ; set clock low again retlw 0 ; ;************************************************************** ; BITIN routine reads one bit of data from the ; serial EE device and stores it in `di' ;************************************************************** BITIN bsf eeprom,di ; assume input bit is high bsf port_b,sclk ; set clock line high nop ; btfss port_b,datout ; read the data bit bcf eeprom,di ; input bit was low bcf port_b,sclk ; set clock line low ;
(c) 1994 Microchip Technology Inc.
DS00560D-page 17
8-115
Using the 93LC56 and 93LC66
0125 0126 0127 0128 0129 0130 0131 0132 0133 0134 0135 0136 0137 0138 0139 0140 0141 0142 0143 0144 0145 0146 0147 0148 0149 0150 0151 0152 0153 0020 0800 retlw 0 ;
0021 0022 0023 0024 0025 0026 0027 0028 0029 002A 002B 002C
006D 0C08 0031 0403 036D 091A 040D 06EA 050D 02F1 0A25 0800
002D 002E
07CA 0A31
;**************************************************************** ; Receive data routine ; This routine reads one byte of data from the part ; into the `datai' register. ;**************************************************************** RX clrf datai ; clear input buffer movlw .8 ; set # bits to 8 movwf count bcf status,0 ; make sure carry bit is low RXLP rlf datai ; rotate the buffer left 1 bit call BITIN ; read 1 bit bcf datai,0 ; assume the input bit was low btfsc eeprom,di ; check the bit bsf datai,0 ; set high if necessary decfsz count ; 8 bits done? goto RXLP ; no, do another retlw 0 ; ;************************************************************* ; BITOUT routine ; This routine takes one bit of data in `do' and ; transmits it to the serial EE device ;************************************************************* BITOUT btfss eeprom,do ; check state of data bit goto bitlow ; low, goto bitlow Mon Jun 06 10:49:20 1994 Page 4
16c5x/7x Cross-Assembler V4.12 Released Line 0154 0155 0156 0157 0158 0159 0160 0161 0162 0163 0164 0165 0166 0167 0168 0169 0170 0171 0172 0173 0174 0175 0176 0177 0178 0179 0180 0181 0182 0183 0184 0185 0186 0187 0188 PC 002F 0030 0031 0032 0033 0034 0035 Opcode 05C6 0A32 04C6 05A6 0000 04A6 0800 bitlow clkout bsf goto bcf bsf nop bcf retlw
port_b,datin clkout port_b,datin port_b,sclk port_b,sclk 0
; ; ; ; ;
high, set datain high and clock it output a logic low set clock line high
; return clock line low
0036 0037
0212 0031
0038 0039 003A 003B 003C 003D 003E 003F
04CA 06F0 05CA 092D 0370 02F1 0A38 0800
; ;**************************************************************** ; Transmit Data Subroutine ; This routine takes the byte of data stored in the ; `datao' register and transmits it to the serial EE device. ;**************************************************************** TX movf bits,w ; set the number of bits to xmit movwf count ; TXLP bcf eeprom,do ; assume bit 7 is low btfsc txbuf,7 ; is bit 7 clear? bsf eeprom,do ; no, set data bit =1 call BITOUT ; transmit 1 bit to serial EE rlf txbuf ; rotate txbuf left decfsz count ; all bits done? goto TXLP ; no, do another bit retlw 0 ; yes, jump out ; ;**************************************************************** ; POWER-UP ROUTINE ; This is the program entry point, which in this case simply ; sets the port_a I/O lines and directs control to the ; erase/write enable routine. ;***************************************************************** PWRUP
DS00560D-page 18
(c) 1994 Microchip Technology Inc.
8-116
Using the 93LC56 and 93LC66
0189 0190 0191 0192 0193 0194 0195 0196 0197 0198 0199 0200 0201 0202 0203 0204 ; 0040 0041 0042 0043 0044 0C11 0005 0065 0C80 0006 movlw tris clrf movlw tris b'00010001' port_a port_a b'10000000' port_b ; set RA0 as input, rest output ; all lines low
; set RB7 as input, rest output; ; ; Fall through and do the read ; ;********************************************************************* ; READ ROUTINE (Sequential read mode) ; This routine reads 8 consecutive addresses in ; sequential mode starting at address 0. This ; program will repeat forever ;********************************************************************* READ Mon Jun 06 10:49:20 1994 Page 5
16c5x/7x Cross-Assembler V4.12 Released Line 0205 0206 0207 0208 0209 0210 0211 0212 0213 0214 0215 0216 0217 0218 0219 0220 0221 0222 0223 0224 0225 0226 0227 0228 0229 0230 0231 0232 0233 0234 0235 0236 0237 PC Opcode ; 0045 0046 0047 0048 0049 004A 004B 004C 004D 004E 004F 0050 0051 0052 0053 0054 0055 0056 0057 0058 0059 005A 005B 005C 005D 005E 0C00 002C 0C08 0033 090E 0C02 0032 0C80 0030 0936 0C08 0032 020C 0030 0936 0921 020D 0037 0921 020D 0037 02AC 02F3 0A54 0486 0A45 0000 rbyte movlw movwf movlw movwf call movlw movwf movlw movwf call movlw movwf movf movwf call call movf movwf call movf movwf incf decfsz goto bcf goto END
.0 addr .8 bytcnt BSTART .2 bits b'10000000' txbuf TX .8 bits addr,w txbuf TX RX datai,w hbyte RX datai,w hbyte addr bytcnt rbyte port_b,chpsel READ
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
set starting address to 00 set number of addresses to read as 8 generate the start bit set # bits to 2 get opcode (10b) into output buffer and transmit it set number of bits to 8 get the address into the output buffer and transmit it
; read the high byte ; move input data to w ; xfer it to high byte ; read the low byte ; move input data to w ; xfer it to low byte ; add 1 to the address ; have all bytes been read? ; no, read another byte ; yes,clear the chip select line ; and start over
8
(c) 1994 Microchip Technology Inc.
DS00560D-page 19
8-117
Using the 93LC56 and 93LC66
NOTES:
DS00560D-page 20
(c) 1994 Microchip Technology Inc.
8-118
Note the following details of the code protection feature on PICmicro(R) MCUs. * * * The PICmicro family meets the specifications contained in the Microchip Data Sheet. Microchip believes that its family of PICmicro microcontrollers is one of the most secure products of its kind on the market today, when used in the intended manner and under normal conditions. There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the PICmicro microcontroller in a manner outside the operating specifications contained in the data sheet. The person doing so may be engaged in theft of intellectual property. Microchip is willing to work with the customer who is concerned about the integrity of their code. Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as "unbreakable". Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our product.
* * *
If you have any further questions about this matter, please contact the local sales office nearest to you.
Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip's products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights.
Trademarks The Microchip name and logo, the Microchip logo, FilterLab, KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER, PICSTART, PRO MATE, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, microPort, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. Serialized Quick Turn Programming (SQTP) is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. (c) 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received QS-9000 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona in July 1999. The Company's quality system processes and procedures are QS-9000 compliant for its PICmicro(R) 8-bit MCUs, KEELOQ(R) code hopping devices, Serial EEPROMs and microperipheral products. In addition, Microchip's quality system for the design and manufacture of development systems is ISO 9001 certified.
2002 Microchip Technology Inc.
M
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18201 Von Karman, Suite 1090 Irvine, CA 92612 Tel: 949-263-1888 Fax: 949-263-1338
China - Shenzhen
Microchip Technology Consulting (Shanghai) Co., Ltd., Shenzhen Liaison Office Rm. 1315, 13/F, Shenzhen Kerry Centre, Renminnan Lu Shenzhen 518001, China Tel: 86-755-2350361 Fax: 86-755-2366086
New York
150 Motor Parkway, Suite 202 Hauppauge, NY 11788 Tel: 631-273-5305 Fax: 631-273-5335
Germany
Microchip Technology GmbH Gustav-Heinemann Ring 125 D-81739 Munich, Germany Tel: 49-89-627-144 0 Fax: 49-89-627-144-44
San Jose
Microchip Technology Inc. 2107 North First Street, Suite 590 San Jose, CA 95131 Tel: 408-436-7950 Fax: 408-436-7955
Hong Kong
Microchip Technology Hongkong Ltd. Unit 901-6, Tower 2, Metroplaza 223 Hing Fong Road Kwai Fong, N.T., Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431
Italy
Microchip Technology SRL Centro Direzionale Colleoni Palazzo Taurus 1 V. Le Colleoni 1 20041 Agrate Brianza Milan, Italy Tel: 39-039-65791-1 Fax: 39-039-6899883
Toronto
6285 Northam Drive, Suite 108 Mississauga, Ontario L4V 1X5, Canada Tel: 905-673-0699 Fax: 905-673-6509
India
Microchip Technology Inc. India Liaison Office Divyasree Chambers 1 Floor, Wing A (A3/A4) No. 11, O'Shaugnessey Road Bangalore, 560 025, India Tel: 91-80-2290061 Fax: 91-80-2290062
United Kingdom
Arizona Microchip Technology Ltd. 505 Eskdale Road Winnersh Triangle Wokingham Berkshire, England RG41 5TU Tel: 44 118 921 5869 Fax: 44-118 921-5820
01/18/02
2002 Microchip Technology Inc.

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