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HT1647 4-level gray scale 64 16 lcd controller for i/o c 1 april 21, 2000 features operating voltage: 2.7v~5.2v built-in 32khz rc oscillator external 32.768khz crystal oscillator or 32khz frequency source input standby current < 1 aat3v,<2 aat5v internal resistor type: 1/5 bias or 1/4 bias, 1/16 duty two selectable lcd frame frequencies: 89hz or 170hz max. 64 16 patterns, 64 segments and 16 commons built-in bit-map display ram: 2048 bits (=64 16 2 bits) built-in internal resistor type bias generator six-wire interface (four data wires) eight kinds of time base/wdt selection time base or wdt overflow output r/w address auto increment built-in buzzer driver (2khz/4khz) power down command reduces power consumption software configuration feature data mode and command mode instructions three data accessing modes provides vlcd pin to adjust lcd operating voltage provides three kinds of bias current programming control of tn-type, stn-type lcds and ecb-type lcds four-level gray scale output for tn-type, stn-type lcds panel four-color output for ecb-type lcds panel available in 100-pin qfp and in chip form general description HT1647 is a peripheral device specially de- signed for i/o type c used to expand the dis- play capability. the max. display segment of the device are 1024 patterns (64 segments and 16 commons). it also supports four data bits in - terface, buzzer sound, watchdog timer or time base timer functions. the HT1647 is a memory mapping and multi-function lcd controller. since the HT1647 can control ecb-type (elec - trically controlled birefringence) lcds in ad - dition to current tn-type (twisted nematic) or stn-type (super twisted nematic) lcds, it can support 4-color display as well as 4-level gray scale display. it displays 4-level gray scale output when HT1647 drives tn-type, stn-type lcds. it displays four color output when HT1647 drives ecb-type. HT1647 uses pwm (pulse width modulation) technique. the software configuration feature of the HT1647 make it suitable for multiple lcd applications including lcd modules and display subsys - tems. only six lines (cs ,wr , db0~db3) are required for the interface between the host con - troller and the HT1647. the ht164x series have many kinds of products that match vari - ous applications. applications toys games personal digital assistant cellular phone global positioning system consumer electronics
4-level gray scale lcd controller product line selection table ht164x *ht1642 *ht1645 HT1647 com 88 16 seg 32 64 64 *under development block diagram HT1647 2 april 21, 2000

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pad assignment chip size: 3865 3770 ( m) 2 * the ic substrate should be connected to vss in the pcb layout artwork. HT1647 4 april 21, 2000 + $ %$ 7 %7 ( %( 8 %8 % %% ' %' 9 %9 6 %6 : %: $# '# $$ '$ $7 '7 $( '( $8 '8 $% '% $' '' $9 '9 $6 '6 $: ': 7# 9# 7$ 9$ 77 97 7( 9( 78 98 7% 9% 7' 9' 79 99 76 96 7: 9: (# 6# ($ 6$ (7 67 (( 6( (8 68 (% 6% (' 6' (9 69 (6 66 (: 6: 8# :# 8$ :$ 87 :7 8( :( 88 :8 8% :% 8' :' 89 :9 86 :6 8: :: %# ;# 0 # < !& 87 !& 8( !& 88 !& 8% !& 8' !& 89 !& 86 !& 8: !& %# !& %$ !& %7 !& %( !& %8 !& %% !& %' !& %9 !& %6 !& %: !& '# !& '$ !& '7 !& '( ! # $ 7 ( -!! !" ! - - " , +
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pad coordinates unit: m pad no. x y pad no. x y pad no. x y 1 1774.50 1708.30 34 331.40 1600.00 67 1775.70 795.30 2 1779.30 1409.80 35 194.50 1558.30 68 1775.70 927.10 3 1779.30 1281.80 36 48.00 1600.00 69 1775.70 1055.10 4 1779.30 1150.00 37 87.40 1600.00 70 1775.70 1186.90 5 1779.30 1022.00 38 235.20 1600.00 71 1775.70 1314.90 6 1779.30 890.20 39 383.40 1600.00 72 1775.70 1446.70 7 1779.30 762.20 40 530.40 1600.00 73 1775.70 1574.70 8 1779.30 630.40 41 678.60 1600.00 74 1775.70 1706.50 9 1779.30 502.40 42 875.00 1712.30 75 1471.10 1708.30 10 1779.30 370.60 43 1003.00 1712.30 76 1343.10 1708.30 11 1779.30 242.60 44 1134.80 1712.30 77 1211.30 1708.30 12 1779.30 110.80 45 1262.80 1712.30 78 1083.30 1708.30 13 1779.30 17.20 46 1394.60 1712.30 79 951.50 1708.30 14 1779.30 149.00 47 1522.60 1712.30 80 823.50 1708.30 15 1779.30 277.00 48 1654.40 1712.30 81 691.70 1708.30 16 1779.30 408.80 49 1782.40 1712.30 82 563.70 1708.30 17 1779.30 536.80 50 1775.70 1411.10 83 431.90 1708.30 18 1779.30 668.60 51 1775.70 1283.10 84 303.90 1708.30 19 1779.30 796.60 52 1775.70 1151.30 85 172.10 1708.30 20 1779.30 928.80 53 1775.70 1023.30 86 44.10 1708.30 21 1779.30 1056.80 54 1775.70 891.50 87 87.70 1708.30 22 1779.30 1189.00 55 1775.70 763.50 88 215.70 1708.30 23 1690.00 1375.40 56 1775.70 631.70 89 347.50 1708.30 24 1690.00 1515.40 57 1775.70 503.70 90 475.50 1708.30 25 1690.00 1651.00 58 1775.70 371.90 91 607.30 1708.30 26 1430.20 1599.90 59 1775.70 243.90 92 735.30 1708.30 27 1294.80 1599.90 60 1775.70 112.10 93 867.10 1708.30 28 1149.50 1599.90 61 1775.70 15.90 94 995.10 1708.30 29 1013.90 1599.90 62 1775.70 147.70 95 1126.90 1708.30 30 872.80 1600.00 63 1775.70 275.70 96 1254.90 1708.30 31 738.30 1600.00 64 1775.70 407.50 97 1386.70 1708.30 32 600.10 1600.00 65 1775.70 535.50 98 1514.70 1708.30 33 465.60 1600.00 66 1775.70 667.30 99 1646.50 1708.30 HT1647 5 april 21, 2000
pad description pad no. pad name i/o description 23 cs i chip selection input with pull-high resistor. when the cs is logic high, the data and command read from or write to the HT1647 are disabled. the serial interface circuit is also reset. but if the cs is at a logic low level and is input to the cs pad, the data and command transmission between the host controller and the HT1647 are all enabled. 24 rd i read clock input with pull-high resistor. data in the ram of the HT1647 are clocked out on the rising edge of the rd signal. the clocked out data will appear on the data line. the host con - troller can use the next falling edge to latch the clocked out data. 25 wr i write clock input with pull-high resistor. data on the data line are latched into the HT1647 on the rising edge of the wr signal. 26~29 db0~db3 i/o parallel data input/output with a pull-high resistor 30 vss negative power supply for logic circuit, ground 31 osci i the osci and osco pads are connected to a 32.768khz crystal in order to generate a system clock. if the system clock comes from an external clock source, the external clock source should be connected to the osci pad. but if an on-chip rc oscillator is selected instead, the osci and osco pads can be left open. 32 osco o 33 vdd positive power supply for logic circuit 34 vlcd i power supply for lcd driver circuit 35 irq o time base or watchdog timer overflow flag, nmos open drain output. 36, 37 bz, bz o 2khz or 4khz frequency output pair (tristate output buffer) 38~41 t1~t4 i not connected 42~57 com0~com15 o lcd common outputs 58~99, 1~22 seg0~seg63 o lcd segment outputs absolute maximum ratings supply voltage.............................. 0.3v to 5.5v storage temperature................. 50 cto125 c input voltage ................v ss 0.3v to v dd +0.3v operating temperature .............. 25 cto75 c note: these are stress ratings only. stresses exceeding the range specified under absolute maxi - mum ratings may cause substantial damage to the device. functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged expo - sure to extreme conditions may affect device reliability. HT1647 6 april 21, 2000
d.c. characteristics ta=25 c symbol parameter test conditions min. typ. max. unit v dd conditions v dd operating voltage 2.7 5.2 v i dd1 operating current 3v no load/lcd on on-chip rc oscillator 150 250 a 5v 250 370 a i dd2 operating current 3v no load/lcd on crystal oscillator 135 200 a 5v 200 300 a i dd11 operating current 3v no load/lcd off on-chip rc oscillator 15 30 a 5v 50 70 a i dd22 operating current 3v no load/lcd off crystal oscillator 210 a 5v 310 a i stb standby current 3v no load power down mode 1 a 5v 2 a v il input low voltage 3v db0~db3, wr ,cs , rd 0 0.6 v 5v 0 1.0 v v ih input high voltage 3v db0~db3, wr ,cs , rd 2.4 3v 5v 4.0 5v i ol1 bz, bz , irq sink current 3v v ol =0.3v 1.2 2.5 ma 5v v ol =0.5v 36 ma i oh1 bz, bz source current 3v v oh =2.7v 0.9 1.8 ma 5v v oh =4.5v 2 4 ma i ol2 db0~db3 sink current 3v v ol =0.3v 1.2 2.5 ma 5v v ol =0.5v 36 ma i oh2 db0~db3 source current 3v v oh =2.7v 0.9 1.8 ma 5v v oh =4.5v 2 4 ma i ol3 lcd common sink current 3v v ol =0.3v 50 100 a 5v v ol =0.5v 100 200 a i oh3 lcd common source current 3v v oh =2.7v 25 50 a 5v v oh =4.5v 50 100 a i ol4 lcd segment sink current 3v v ol =0.3v 30 60 a 5v v ol =0.5v 60 120 a i oh4 lcd segment source current 3v v oh =2.7v 20 40 a 5v v oh =4.5v 35 70 a r ph pull-high resistor 3v db0~db3, wr ,cs , rd 150 250 350 k 5v 60 125 180 k HT1647 7 april 21, 2000
a.c. characteristics ta=25 c symbol parameter test conditions min. typ. max. unit v dd conditions f sys1 system clock 3v on-chip rc oscillator 22 32 40 khz 5v 24 32 40 khz f sys2 system clock 3v crystal oscillator 32.768 khz 5v 32.768 khz f sys3 system clock 3v external clock source 32 khz 5v 32 khz f lcd1 lcd frame frequency 3v on-chip rc oscillator 44 64 80 hz 5v 48 64 80 hz f lcd2 lcd frame frequency 3v crystal oscillator 64 hz 5v 64 hz f lcd3 lcd frame frequency 3v external clock source 64 hz 5v 64 hz t com lcd common period n: number of com n/f lcd sec f clk1 4-bit data clock (wr pin) 3v duty cycle 50% 150 khz 5v 300 khz f clk2 4-bit data clock (rd pin) 3v duty cycle 50% 75 khz 5v 150 khz t cs 4-bit interface reset pulse width (figure 3) cs 250 ns t clk wr ,rd input pulse width (figure 1) 3v write mode 3.34 s read mode 6.67 5v write mode 1.67 s read mode 3.34 t r ,t f rise/fall time serial data clock width (figure 1) 3v 120 ns 5v t su setup time for db to wr , rd clock width (figure 2) 3v 120 ns 5v t h hold time for db to wr ,rd clock width (figure 2) 3v 120 ns 5v t su1 setup time for cs to wr ,rd clock width (figure 3) 3v 100 ns 5v t h1 hold time for cs to wr ,rd clock width (figure 3) 3v 100 ns 5v HT1647 8 april 21, 2000
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1 . 0 1 $ $ ! - - figure 3 functional description system oscillator the HT1647 system clock is used to generate the time base/watchdog timer (wdt) clock fre - quency, lcd driving clock, and tone frequency. the source of the clock may be from an on-chip rc oscillator (32khz), a crystal oscillator (32.768khz), or an external 32khz clock by the s/w setting. the configuration of the system os- cillator is as shown. after the sys dis com- mand is executed, the system clock will stop and the lcd bias generator will turn off. that command is, however, available only for the on-chip rc oscillator or for the crystal oscilla- tor. once the system clock stops, the lcd dis- play will become blank, and the time base/wdt loses its function as well. the lcd off command is used to turn the lcd bias generator off. after the lcd bias gen - erator switches off by issuing the lcd off command, using the sys dis command re - duces power consumption, serving as a system power down command. but if the external clock source is chosen as the system clock, using the sys dis command can neither turn the oscilla- tor off nor carry out the power down mode. the crystal oscillator option can be applied to con- nect an external frequency source of 32khz to the osci pin. in this case, the system fails to enter the power down mode, similar to the case in the external 32khz clock source operation. at the initial system power on, the HT1647 is at the sys dis state. !" ! (79'6? @ & a 1 ! (71? @ b (71? @ ! 1 system oscillator configuration
HT1647 10 april 21, 2000 !& # !& $ !& 7 !& ( !& '( $8 $% %$$ 9 7( ($ # $ # %#8 # 6 78 8 ; (0 70 $0 #< : ; 6 0 9 0 cccc0 # < $' $ 7 ( # $ 7 ( $% /
5 3 4 d a 8b 8b c display memory - ram structure display memory ram structure the static display ram is organized into 512 4 bits and stores the display data. two bits of ram map to lad s one pixel and decide whether 4-level gray scale or 4-color display concurrently. the contents of the ram are di - rectly mapped to the contents of the lcd driver. data in the ram can be accessed by the read, write and read-modify-write commands. the following is a mapping from the ram to the lcd patterns. gray scale level decision HT1647 uses pwm technique to provide 4-level gray scale display. two bits of ram data code ((d3, d2) or (d1, d0)) decide one pixel level of lcds, level 1~level 4 dividedly. every level must be defined as one kind of gray scale by pwm data (namely b4~b0) previously. ram data code (d3, d2) or (d1, d0) choice gray scale level (1, 1) level 1 (1, 0) level 2 (0, 1) level 3 (0, 0) level 4 ram data defined gray scale level frame frequency HT1647 provides two kinds frame frequency op- tion by command code, 89hz and 170hz respec- tively. frame 89hz provides 89hz frame frequency and active segment signal width can be divided into 24 sections concurrently. frame 170hz provides 170hz frame frequency and ac - tive segment signal width can be divided into 13 sections concurrently. the 24 sections display a particularly gray scale more than the 13 sections by pwm data. the default is frame 89hz. gray scale display if the user choose 89hz frame frequency, a max. of 24 sections can be programmed to suit a sat - isfactory gray scale in every level. similarly, if the user choose 170hz frame frequency, a max. of 13 sections can be programmed to suit a satis -
HT1647 11 april 21, 2000 name command code function frame 170hz x 100 -0001-1000-xxxx select 170hz frame frequency and active segment signal width can be divided into 13 sections frame 89hz x 100 -0001-1101-xxxx select 89hz frame frequency and active segment sig - nal width can be divided into 24 sections frame frequency selection command code factory gray scale in every level. HT1647 provides 5-bit pwm data to control the length of the sec - tion. in other words, a max. 24 gray scales are gen - erated by 5-bit binary pwm data. at frame 89hz mode, the HT1647 only provides a max. of 24 adjustable gray scales although 32 is the ex - pressed max. value by 5 bits binary code. when 5 bits binary code value is more than 23, the pwm control circuit uniformly regards 23. to increase pwm data indicates to increase the length of the active segment signal. the varied length of the ac - tive segment signal displays varied gray scale in tn-type, stn-type lcds (refer to table 1). simi - larly, it displays varied color in ecb-type lcds. the color display is derived from ecb-type lcd specification. at frame 170hz mode, the HT1647 only provides a max. of 13 adjustable gray scales although 32 is the expressed max. value by 5 bits binary code. when the 5 bits bi - nary code value is more than 12, the pwm con - trol circuit uniformly regards 12. the user must appoint four kinds of pwm data to four kinds of different gray scale level by commanding pwm data (refer to table 2). name command code function grs level 1 x 100 -001 b4-b3 b2 b1 b0-xxxx set pwm data in gray scale level 1 grs level 2 x 100 -010 b4-b3 b2 b1 b0-xxxx set pwm data in gray scale level 2 grs level 3 x 100 -011 b4-b3 b2 b1 b0-xxxx set pwm data in gray scale level 3 grs level 4 x 100 -100 b4-b3 b2 b1 b0-xxxx set pwm data in gray scale level 4 four kinds of gray scale level command code
HT1647 12 april 21, 2000 e $' $ 7 - -$ -7 -( -8 - !! d - -$ -7 -( -8 - !! !& d - (%- $%- b$ % - b( % - b- 2!& $ 4 . )) . . / f df 5 ;g3 5 3 h < f f a c 5 h ; . 5 HT1647 13 april 21, 2000 time base and watchdog timer wdt the time base generator and wdt share the same divided (/256) counter. the irq clock can be programmed as 1hz, 2hz, ...., 128hz output. timer dis/en/clr, wdt dis/en/clr and irq en/dis are independent from each other. once the wdt time-out occurs, the irq pin will remain at a logic low level until the clr wdt or the irq dis command is issued. if an external clock is selected as the system frequency source, the sys dis command turns out invalid and the power down mode fails to be carried out until the external clock source is re - moved.
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" & &. "! time base and wdt configurations name command code function tone off x100 -0000-1000-xxxx turn-off tone output tone 4k x100 -0001-0000-xxxx turn-on tone output, tone frequency is 4khz tone 2k x100 -0001-0001-xxxx turn-on tone output, tone frequency is 2khz buzzer tone output command code buzzer tone output a simple tone generator is implemented in the HT1647. the tone generator can output a pair of differential driving signals on the bz and bz which are used to generate a single tone. by executing the tone 4k and tone 2k com- mands there are two tone frequency outputs selectable and turn on tone output. the tone 4k and tone 2k commands set the tone fre - quency to 4khz and 2khz, respectively. the tone output can be turned off by invoking the tone off command. the tone outputs, namely bz and bz , are a pair of differential driving outputs used to drive a piezo buzzer. once the system is disabled or the tone output is inhibited, the bz and the bz outputs will re- main at low level. command format the HT1647 can be configured by software set - ting. there are two mode commands to config - ure the HT1647 resource and to transfer the lcd display data. the configuration mode of the HT1647 is called command mode, and its command mode id is 100. the command mode consists of a system configuration command, a system frequency se - lection command, an lcd configuration com - mand, a tone frequency selection command, a bias current selection command, a gray scale level selection command, a timer/wdt setting command, and an operating command. the data mode, on the other hand, includes read, write, and read-modify-write opera - tions.
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- 3 5 - i g - 4 0 - j % - 0 - j 8 - 0 - j $ % 1 7 # = - i - i internal resistor type bias generator configurations the following are the data mode id and the command mode id: operation mode id read data 110 write data 101 read-modify-write data 101 command command 100 if successive commands have been issued, the command mode id can be omitted. while the system is operating in the non-successive com - mand or the non-successive address data mode, the cs pin should be set to 1 and the previous operation mode will also be reset. the cs pin returns to 0 , so a new operation mode id should be issued first. bias generator the HT1647 bias voltage belong to internal re - sistor type. it provides two kinds of bias option named 1/5 bias and 1/4 bias respectively. it is recommeaded to select 1/5 bias to fit tn-type, stn-type lcds and select 1/4 bias to fit ecb-type lcds. it also provides three kinds of bias current option by programming to suitably drive lcd panel. the three kinds of bias cur - rent are large, middle, and small, respectively. usually, large panel lcd can be excellently dis - played by large bias current. relatively, it con - sumes large current when lcd on command is used. small bias current provides low power consumption during on condition when the lcd is normally displayed. the following are the reference value table. vlcd bias large bias current middle bias current small bias current 4v 1/5 300 a 100 a40 a 4v 1/4 375 a 125 a50 a
HT1647 15 april 21, 2000 interfacing only six lines are required to interface with the HT1647. the cs line is used to initialize the se - rial interface circuit and to terminate the commu - nication between the host controller and the HT1647. if the cs pin is set to 1, the data and command issued between the host controller and the HT1647 are first disabled and then initial - ized. before issuing a mode command or mode switching, a high level pulse is required to initial - ize the serial interface of the HT1647. the db0~db3 are the 4-bit parallel data input/out - put lines. data to be read or written or commands to be written have to pass through the db0~db3 lines. the rd line is the read clock input. data in the ram are clocked out on the falling edge of the rd signal, and the clocked out data will then appear on the db0~db3 lines. it is recommended that the host controller read in correct data dur - ing the interval between the rising edge and the next falling edge of the rd signal. the wr line is the write clock input. the data, address, and command on the db0~db3 lines are all clocked into the HT1647 on the rising edge of the wr sig - nal. there is an optional irq line to be used as an interface between the host controller and the HT1647. the irq pin can be selected as a timer output or a wdt overflow flag output by the s/w setting. the host controller can perform the time base or the wdt function by connecting with the irq pin of the HT1647. relationship table between pwm data and gray scale frame 89hz mode (table 1) !" # $ $% $& $ $ # $ 7 ( 8 % ' 9 6 : $# $$ $7 $( $8 $% $' $9 $6 $: 7# 7$ 77 7( 78 ($ # # # # # # # # # # # # # # # # # # $ $ $ $ $ $ $ $ $ $ $ $ # $ # $ # $ $ ;787(< $ ;($7(< # # # # # # $ $ $ $ $ $ $ $ # # # # # # # # $ $ $ $ # # # # $ $ $ $ # # # # # # # # $ $ $ $ # # # $ $ $ # # # $ $ $ # # # $ $ $ # # # $ $ $ # # $ $ # # $ $ # # $ $ # # $ $ # # $ $ # # $ $ # ;#7(< $7( 77( (7( 87( %7( '7( 97( 67( :7( $#7( $$7( $77( $(7( $87( $%7( $'7( $97( $67( $:7( 7#7( 7$7( 777( $ ;7(7(< !" # $ $% $& $ $ # $ 7 ( 8 % ' 9 6 : $# $$ $7 $( ($ # # # # # # # # # # # # # # # # $ $ $ $ $ $ ;($$7< # # # # # # $ $ $ $ $ $ $ $ # # # # # # # # $ $ $ $ # # # $ $ $ # # # $ $ $ # # # $ # # $ $ # # $ $ # # $ $ # ;#$7< $$7 7$7 ($7 8$7 %$7 '$7 9$7 6$7 :$7 $#$7 $$$7 $ ;$7$7< $ ;$($7< . /
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timing diagrams read mode (command id cod e:110) HT1647 16 april 21, 2000 ( ! 9 ( ( ( 6 ( ( ( ( ( ( ( ( ( ( ( ( ( ( 6 9 ( ( 7 ' 7 7 7 $ 7 7 7 7 7 7 7 7 7 7 7 7 7 7 $ ' 7 7 $ # % $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ % $ $ 8 # # # # # # # # # # # # # # # # # # # 8 # # ; < ; < " ; k$%< ; k$8< ; k$(< ; k$7< ; k$$< ; k$#< ; k:< ; k6< ; k9< ; k'< ; k%< ; k8< ; k(< ; k7< ; k$< ; < ; < " ;! < ;! <
write mode (command id cod e:101) HT1647 17 april 21, 2000 ( ! 9 ( ( ( 6 ( ( ( ( ( ( ( ( ( ( ( ( ( ( 6 9 ( ( 7 ' 7 7 7 $ 7 7 7 7 7 7 7 7 7 7 7 7 7 7 $ ' 7 7 $ # % $ $ $ # $ $ $ $ $ $ $ $ $ $ $ $ $ $ #%$ $ 8 # # # $ # # # # # # # # # # # # # # $8# # ; < ; < " ; k$%< ; k$8< ; k$(< ; k$7< ; k$$< ; k$#< ; k:< ; k6< ; k9< ; k'< ; k%< ; k8< ; k(< ; k7< ; k$< ; < ; < " ;! 5 < ;! 5 <
read-modify-write mode (command id cod e:101) HT1647 18 april 21, 2000 ( ! 9 ( ( 6 ( ( ( ( ( ( ( ( ( ( ( ( ( 6 9 ( ( 7 ' 7 7 $ 7 7 7 7 7 7 7 7 7 7 7 7 7 $'77 $ # % $ $ # $ $ $ $ $ $ $ $ $ $ $ $ $ #%$$ 8 # # $ # # # # # # # # # # # # # $8## ; < ; < " ; k'< ; k'< ; k%< ; k8< ; k(< ; k7< ; k$< ; < ; < ; < " ;! < ;! < ( 7 $ # ; < ; k%< ; k8< ; k(< ; k7< ; k$<
command mode (command id cod e:100) note: x stands for don t care HT1647 19 april 21, 2000 ( ! 6 8 # 6 l 8#68#68#68#68# l68# 7 9 ( l $ $9(l $ # # #'7l # # " ' " ;! < 9 ( l 9 ( l 9 ( l 9 ( l 9 ( l ' 7 l ' 7 l ' 7 l ' 7 l ' 7 l ' 7 l % $ l % $ l % $ l % $ l % $ l % $ l % $ l % 8 ( 7 $ ;! <
application circuits host controller with an HT1647 display system *note: the connection of irq and rd pin can be selected depending on the c. the voltage applied to v lcd pin must be lower than v dd . adjust vr to fit lcd display, at v dd =5v, v lcd =4v, vr=15k
20%. it is recommended to select 1/5 bias to fit tn-type, stn-type lcds and select 1/4 bias to fitm ecb-type lcds. adjust r (external pull high resistance) to fit user s time base clock. HT1647 20 april 21, 2000 " , #2( i b ! !" ! 1 & a 1 $ ;(71? @< & a 1 7 ;(71? @< ! ' (79'6? @ (' ) * + + # 2 $ % ! & # 2 ! & ' ( h @ i$% ; $8 <0 $$' i - i - -
instruction set summary name command code d/c function def. read a8 110 -a7a6a5a4a3a2a1a0d3d2d1d0 d read data from the ram write a8 101 -a7a6a5a4a3a2a1a0d3d2d1d0 d write data to the ram read- modify- write a8 101 -a7a6a5a4a3a2a1a0d3d2d1d0 d read and write data to the ram sys dis x 100 -0000-0000-xxxx c turn off both system oscillator and lcd bias generator yes sys en x 100 -0000-0001-xxxx c turn on system oscillator lcd off x 100 -0000-0010-xxxx c turn off lcd display yes lcd on x 100 -0000-0011-xxxx c turn on lcd display timer dis x 100 -0000-0100-xxxx c disable time base output yes wdt dis x 100 -0000-0101-xxxx c disable wdt time-out flag output yes timer en x 100 -0000-0110-xxxx c enable time base output wdt en x 100 -0000-0111-xxxx c enable wdt time-out flag output tone off x 100 -0000-1000-xxxx c turn off tone outputs yes clr timer x 100 -0000-1101-xxxx c clear the contents of the time base generator clr wdt x 100 -0000-1111-xxxx c clear the contents of the wdt stage tone 4k x 100 -0001-0000-xxxx c turn on tone output, tone frequency output: 4khz tone 2k x 100 -0001-0001-xxxx c turn on tone output, tone frequency output: 2khz irq dis x 100 -0001-0010-xxxx c disable irq output yes irq en x 100 -0001-0011-xxxx c enable irq output rc 32k x 100 -0001-0100-xxxx c system clock source, on-chip rc oscillator yes ext (xtal) x 100 -0001-0101-xxxx c system clock source, external 32khz clock source or crystal oscillator 32.768khz large bias x 100 -0001-0110-xxxx c large bias current option yes middle bias x 100 -0001-0111-xxxx c middle bias current option HT1647 21 april 21, 2000
name command code d/c function def. small bias x 100 -0001-1000-xxxx c small bias current option bias 1/5 x 100 -0001-1001-xxxx c lcd 1/5 bias option yes bias 1/4 x 100 -0001-1010-xxxx c lcd 1/4 bias option frame 170hz x 100 -0001-1100-xxxx c select 170hz frame frequency and active segment signal width can be divided 13 sections frame 89hz x 100 -0001-1101-xxxx c select 89hz frame frequency and active segment signal width can be divided 24 sections yes grs level1 x 100 -001 b4-b3 b2 b1 b0-xxxx c set pwm data in gray scale level 1 grs level2 x 100 -010 b4-b3 b2 b1 b0-xxxx c set pwm data in gray scale level 2 grs level3 x 100 -011 b4-b3 b2 b1 b0-xxxx c set pwm data in gray scale level 3 grs level4 x 100 -100 b4-b3 b2 b1 b0-xxxx c set pwm data in gray scale level 4 f1 x 100 -1010-0000-xxxx c time base clock output: 1hz the wdt time-out flag after: 4s f2 x 100 -1010-0001-xxxx c time base clock output: 2hz the wdt time-out flag after: 2s f4 x 100 -1010-0010-xxxx c time base clock output: 4hz the wdt time-out flag after: 1s f8 x 100 -1010-0011-xxxx c time base clock output: 8hz the wdt time-out flag after: 1/2 s f16 x 100 -1010-0100-xxxx c time base clock output: 16hz the wdt time-out flag after: 1/4 s f32 x 100 -1010-0101-xxxx c time base clock output: 32hz the wdt time-out flag after: 1/8 s f64 x 100 -1010-0110-xxxx c time base clock output: 64hz the wdt time-out flag after: 1/16 s f128 x 100 -1010-0111-xxxx c time base clock output: 128hz the wdt time-out flag after: 1/32 s yes test x 100 -1111-1111-xxxx c test mode, user don t use. normal x 100 -1111-1110-xxxx c normal mode yes HT1647 22 april 21, 2000
note: x stands for don t care a8~a0 : ram address d3~d0 : ram data b4~b0 : pwm data d/c : data/command mode def. : power-on reset default all the bold forms, namely 110 , 101 , and 100 , are mode commands. of these, 100 indicates the command mode id. if successive commands have been issued, the command mode id ex - cept for the first command will be omitted. the source of the tone frequency and of the time base/wdt clock frequency can be derived from an on-chip 32khz rc oscillator, a 32.768khz crystal oscillator, or an external 32khz clock. calculation of the frequency is based on the sys - tem frequency sources as stated above. it is recommended that the host controller should ini - tialize the HT1647 after power-on reset, for power on reset may fail, which in turn leads to the malfunctioning of the HT1647. HT1647 23 april 21, 2000
HT1647 24 april 21, 2000 copyright 2000 by holtek semiconductor inc. the information appearing in this data sheet is believed to be accurate at the time of publication. however, holtek assumes no responsibility arising from the use of the specifications described. the applications mentioned herein are used solely for the purpose of illustration and holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may pres - ent a risk to human life due to malfunction or otherwise. holtek reserves the right to alter its products without prior notification. for the most up-to-date information, please visit our web site at http://www.holtek.com.tw. holtek semiconductor inc. (headquarters) no.3 creation rd. ii, science-based industrial park, hsinchu, taiwan, r.o.c. tel: 886-3-563-1999 fax: 886-3-563-1189 holtek semiconductor inc. (taipei office) 5f, no.576, sec.7 chung hsiao e. rd., taipei, taiwan, r.o.c. tel: 886-2-2782-9635 fax: 886-2-2782-9636 fax: 886-2-2782-7128 (international sales hotline) holtek semiconductor (hong kong) ltd. rm.711, tower 2, cheung sha wan plaza, 833 cheung sha wan rd., kowloon, hong kong tel: 852-2-745-8288 fax: 852-2-742-8657

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