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STR720-EVAL Evaluation Board for STR72xF STR720-EVAL board Host to JTAG interface High speed JTAG debug port connection Main components Description The STR720-EVAL board is a complete development platform for the STR720 series. It is a cost effective, flexible and open design to demonstrate the capability of the STR720 series of microcontrollers and enable rapid evaluation of the STR720 devices and peripherals. It uses the high performance STR720 ARM720TTM device that embeds 8 Kbytes unified cache, has a memory management unit (MMU), 16K program RAM and numerous peripheral interfaces, including USB and CAN. The STR720-EVAL board includes shared memory interface (SMI) SDRAM and flash memory on the external memory interface (EMI) to enable freedom in development of large programs before custom hardware is designed. It integrates a 2 x 16 LCD, LEDs, UART, CAN, USB interfaces and test buttons to create a versatile stand-alone test platform. A wide choice of third party development tools are available in addition to those available from STMicroelectronics. Rev 2 1/31 www.st.com 1 STR720 processor running at 66 MHz EMI flash 4 Mbytes (2M x 16) SMI SDRAM 16 Mbytes (2 x (4M x 16)) SPI serial flash LCD display Features Support for the following interfaces: - ATAPI - USB - CAN - RS232 LED displays Test buttons JTAG connector October 2005 STR720-EVAL 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 1.2 1.3 1.4 Processor and memory devices on this board . . . . . . . . . . . . . . . . . . . . . . . . 3 Board interface connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Push buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 2.12 2.13 2.14 2.15 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Debug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Prototype area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Power supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 USB full speed interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 CAN interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 RS232 serial interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Analog input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Push buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Option jumper placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Option switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3 Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.1 3.2 3.3 3.4 3.5 3.6 USB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 CAN bus connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 RS232 serial data connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Debug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 ATAPI interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 ADC input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.1 4.2 STR720-EVAL board top sheet 1 of 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 STR720-EVAL board top sheet 2 of 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 1/31 STR720-EVAL 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12 STR720-EVAL board - SMI SDRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 STR720-EVAL board - EMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 STR720-EVAL board - EMI ATAPI interface . . . . . . . . . . . . . . . . . . . . . . . . . 22 STR720-EVAL board - EMI flash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 STR720-EVAL board - EMI LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 STR720-EVAL board - ARM JTAG interface . . . . . . . . . . . . . . . . . . . . . . . . . 25 STR720-EVAL board - USB interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 STR720-EVAL board - CAN interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 STR720-EVAL board - serial flash interfaces . . . . . . . . . . . . . . . . . . . . . . . . . 28 STR720-EVAL board - RS232 interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 2/31 1 Introduction STR720-EVAL 1 Introduction STMicroelectronics is a global independent semiconductor company that designs, develops, manufactures and markets a broad range of semiconductor integrated circuits and discrete devices used in a wide variety of applications. The STR720-EVAL board is based on the STR720, a highly integrated microcontroller, running at 66 MHz. It combines the popular ARM720TTM 32-bit RISC CPU that embeds 8 Kbytes of unified cache and a memory management unit (MMU) with16 Kbytes of program RAM, external SDRAM interface for up to 128 Mbytes of SDRAM, an EMI for up to 8 Mbytes of SRAM, flash or ROM and numerous on-chip peripherals. This board is intended as a low cost development platform to demonstrate the capability of the STR720 series of micro-controllers and to enable rapid evaluation of the STR720 devices and available peripherals. The STR720-EVAL board has 4 Mbytes of flash on EMI, 1-Mbit SPI serial flash and 16 Mbytes of SDRAM. It supports ATAPI, USB, CAN and RS232 interfaces. The on-board chip STR720RBQ6 is an ARM720TTM 32-bit RISC micro-controller with cache and MMU. This board includes a 2x16 programmable LCD display supported by reset, RTC reset, next, select and previous push buttons. The hardware platform of the STR720 series is supported by an extensive software support package, including device drivers in ANSI C source form and demonstration software. It is flashed with a demonstration application that shows the basic features of the device. Development tools are readily available. This is complemented by a range of third party realtime OS and middleware. Design schematics can also be supplied in electronic format to those customers with compatible design environments. Note: ARM(R) and ARM7TDMITM are registered trademarks of ARM Limited in the EU and other countries. 1.1 Processor and memory devices on this board STR720 ARM720TTM processor running at 66 MHz, IC9: - - - - - - 208-pin PQFP version, 8 Kbytes cache, 16 Kbytes program RAM, memory management unit (MMU), dual voltage, 1.8 V for core supply and 3.3 V for inputs/outputs, nested interrupt controller. flash (bank 0) 4 Mbytes arranged as 2M x 16: IC17, LCD (bank 0), see Section 1.4 on page 4: LCD1, ATAPI interface: CN3 External memory interface: - - - SMI (bank 0) 16 Mbytes SDRAM arranged as (2 x (4M x 16)): IC8, IC15, 3/31 STR720-EVAL 1 Introduction Clocking: - - +3.3 V surface mounted 16 MHz oscillator provides the main clock source, RTC real-time clock with embedded 32 KHz oscillator. Serial ROM. A 1-Mbit SPI serial flash connected to the buffered serial peripheral interface (BSPI): IC20. 1.2 Board interface connections Diagrams and wiring descriptions for these connectors are provided in Section 4 on page 18. The following connections are supported by the board: USB support USB device using a type B connector: CN8, CAN uses a single 9 D-type connector with microswitch selectable low or high speed transceiver: CN7, UART1 (Rx and Tx only) connected to a 9-way male D-type RS232 connector: CN5, UART2 (Rx and Tx only) connected to a 9-way male D-type RS232 connector: CN6, JTAG, 20 pin IDC connector: CN2, variable resistor voltage range 0 to 2.5 V: VR1, LM35 temperature sensor: IC4, prototype area: GD1, test points various test points are located throughout the board, for details see Section 4.1 on page 18, main power supply: CN1. 1.3 Push buttons The following push buttons are provided, they are described further in Section 2.13 on page 10: reset (RST), board reset: SW1, previous (PRV), programmable switch: SW8, next (NXT), programmable switch: SW9, select (SEL), programmable switch: SW10, RTC reset (RTCRST): SW11. 1.4 Displays The following LCD and LEDs are provided: LCD write-only display, 2x16 LCD display connected to the EMI using a buffer and address decode logic, green back light display: LCD1, surface mount red +5 V and +3.3 V power indicators: LD1, LD2, surface mount yellow, IDE ATAPI +3.3 V power indicator: LD3, surface mount yellow, USB connection indicator: LD18, bi-color red/green, reset indicator: LD4, low consumption LEDs red: LD5, LD6, LD7, LD8, LD9, LD10, LD11, LD12, LD13, LD14, LD15, LD16, LD17. 4/31 2 Hardware STR720-EVAL 2 Figure 1. Hardware STR720-EVAL board layout block diagram Prototype area GD1 DC power filter IC1 +5 V power CN1 RS232-A UART 1 Rx and Tx only CN5 3.3 V linear voltage regulator CN1 LD1 LD2 +3 V IC19 SDRAM IC15 RS232-B UART 2 Rx and Tx only CN6 SPI serial flash IC20 1.8 V linear voltage regulator IC3 SDRAM IC8 Debug CN2 ADC input CN4 STR720 ARM720TTM Variable resistor VR1 LM35 IC4 16 MHz oscillator IC5 CAN CN7 LD4 LD 12 LD 13 LD 14 LD 15 LD 16 LD 17 LD 5 LD 6 LD 7 LD 8 LD 9 LD 10 LD 11 EMI flash IC17 Low voltage invertor IC12 USB CN8 LD18 Low voltage CMOS IC18 ATAPI CN3 RST PRV NXT RTCRST SEL LD3 LCD display EMI 5/31 STR720-EVAL 2 Hardware Figure 2. STR720-EVAL board system block diagram Prototype area LEDs In-circuit emulator JTAG CAN RS232 Rx and Tx USB UART1 Flash RS232 Rx and Tx UART2 EMI/IDE ATAPI Variable resistor LCD Analog input Temperature sensor SMI SDRAM 5V power BSPI1 SPI serial flash 6/31 2 Hardware STR720-EVAL 2.1 Overview The STR720-EVAL board is a general purpose evaluation platform with ATAPI, USB, CAN (controller area network) and RS232 interfaces. 2.2 Processor The board supports the STR720 ARM720TTM silicon - 208-pin PQFP version. This chip runs at a frequency of 66 MHz. Boot modes and configuration options are set using microswitches, see Section 2.15: Option switch settings on page 12 2.3 Debug Software debug is performed using a standard 20-pin JTAG connection. This may connect to a JTAG in-circuit emulator. 2.4 Prototype area A 2.54x2.54mm gridded area of 1mm holes is available for prototyping using wire wrap or similar prototyping techniques. 2.5 Reset The reset sources are: power on reset, push button reset, JTAG reset from an in-circuit emulator. 2.6 Memory Table 1. Region SDRAM STR720-EVAL board SDRAM memory map Usage Memory map used 0xA000 0000 - 0xA0FF FFFF Table 2. Region 3 2 1 STR720-EVAL board EMI memory map Usage EMI flash LCD Memory map used 0x4000 0000 - 0x5FFF FFFF 0x4000 0000 - 0x403F FFFF 0x4040 0000 - 0x407F FFFF 7/31 STR720-EVAL 2 Hardware 2.7 Power supplies Power to the board is supplied using a lump in cord power supply providing 5 V to the board. All other required voltages are provided on-board by voltage regulators or voltage convertors. 2.8 USB full speed interface USB full speed interface device supported by a type B connector. The USB clock uses a separate 48 MHz oscillator. See Section 3.1: USB on page 14. 2.9 CAN interface A general purpose, asynchronous serial I/O data port connected through a 9-pin D-type male connector with microswitch selectable low speed fault tolerant transceiver (L9669) or low or high speed selectable transceiver (L9616). See Section 3.2: CAN bus connector on page 14. The L9669 transceiver only works in normal mode, the wake-up functionality is not implemented. Caution: The board schematic for the CAN interface detailed in Section 4.10: STR720-EVAL board - CAN interface, is not a reference design and should not be copied. To design a CAN interface with the STR720 please refer to the "STR720 Hardware Development Getting Started Guide AN1907". 2.10 RS232 serial interfaces Two general purpose, asynchronous serial I/O data ports are connected through 9-pin D-type male connectors. Refer to Section 3.3: RS232 serial data connector on page 15. RS232-A connects directly to UART1, transmit and receive only. RS232-B connects to UART2, transmit and receive only. RTS is shorted to CTS and DTR is shorted to DSR at the connector for both interfaces. 2.11 Analog input The following analog inputs are provided, see the schematics Section 4.1 on page 18: ADC connector: CN4, LM35 temperature sensor IC4 is connected to pin 4 of the ADC connector CN4 (pins 3 and 4 must be shorted to enable temperature sensing,) variable resistor VR1 is connected to pin 2 of the ADC connector CN4 (pins 1 and 2 must be shorted to enable the variable resistor.) 8/31 2 Hardware STR720-EVAL If pins 5 and 7 are not used they should be shorted to pins 6 and 8 respectively. Alternatively the analog inputs can be used directly by removing the shorting and connecting the signal to be sampled to links 1, 3, 5 or 7, see Figure 3. Figure 3. ADC connector CN4: applying shorting STR720 ANA0 ANA1 ANA2 ANA3 1 3 5 7 CN4 2 4 6 8 Variable resistor Temperature sensor LM35 2.12 LEDs Software controlled LEDs The (red) LEDs in Table 3 are software controlled by PIO pins. See the schematic in Section 4.1 on page 18. Table 3. Software controlled LEDs LED LD5 LD6 LD7 LD8 LD9 LD10 LD11 LD12 LD13 LD14 LD15 LD16 LD17 Signal name LED_P3_7 LED_P3_11 LED_P3_12 LED_P4_1 LED_P4_2 LED_P4_3 LED_P4_4 LED_P3_0 LED_P3_1 LED_P3_2 LED_P3_3 LED_P3_4 LED_P3_5 9/31 STR720-EVAL 2 Hardware Status LEDs Table 4. LED LD1 LD2 LD3 LD4 LD18 Status LEDs Description +5 V +3.3 V ATAPI HDD reset indicator USB indicator Schematic Color Red Red Yellow Red/green Yellow Section 4.2 on page 19 Section 4.2 on page 19 Section 4.5 on page 22 Section 4.1 on page 18 Section 4.9 on page 26 2.13 Push buttons Table 5. Status push buttons Connected to power on reset P3.10_EINT2 P3.8_EINT0 P3.9_EINT1 not RTC_reset Schematic Button Board reset SW1 Previous SW8 Next SW9 Select SW10 RTC reset SW11 Section 4.8 on page 25 Section 4.1 on page 18 Section 4.1 on page 18 Section 4.1 on page 18 Section 4.1 on page 18 2.14 Option jumper placement Jumpers are fitted as shown in Figure 4, the position of the jumbers on the board are shown in Figure 5 on page 11. Figure 4. Jumper positions Not fitted Do not fit Fitted Table 6. Jumper J1 J2 Option jumpers Figure Description notRST to notJTRST connect: fitted = enabled, not fitted = disabled CAN loopback link: not fitted / fitted (default) Default Fitted Not fitted Section 4.8 on page 25 Section 4.10 on page 27 10/31 2 Hardware STR720-EVAL Figure 5. Option jumpersm resistors and switches Prototype area SW3 SW4 J1 SW5 SW6 J2 SW7 SW2 STR720 ARM720TTM PRV SW8 SW9 SW11 SW10 Push buttons RTCRST NXT RST SEL SW1 Push button 11/31 STR720-EVAL 2 Hardware 2.15 Option switch settings For switch position details, see Figure 6. Figure 6. Switch positions 1-2 2-3 1 1 A 1 A A Microswitches Slide switches Table 7. Switch SW1 Option switch settings Schematic Description Reset Boot mode: 1-2 = Boot from internal ROM 2-3 = Boot from external flash See Figure 7 and Figure 8 on page 13. SPI flash notW: 1-2 = Active 2-3 = Inactive SPI flash notHOLD: 1-2 = Active 2-3 = Inactive CAN transceiver select: L9669 / L9616 (default) Note SW5 and SW6 must be changed together. 1 = L9669 A = L9616 L9616 ASC speed: 1-2 = pull down = high speed 2-3 = pull up = low speed Previous Next Select RTC reset Default Push to make Section 4.1 on page 18 Section 4.1 on page 18 SW2 2-3 Section 4.11 on page 28 SW3 2-3 Section 4.11 on page 28 SW4 SW5 2-3 1 Section 4.10 on page 27 SW6 1 Section 4.10 on page 27 SW7 SW8 SW9 SW10 SW11 2-3 Push to make Push to make Push to make Push to make Section 4.1 on page 18 Section 4.1 on page 18 Section 4.1 on page 18 Section 4.1 on page 18 12/31 2 Hardware STR720-EVAL Figure 7. SW2 boot from internal ROM SW2 = 1-2 Boot from internal ROM STR720 SW2 EXT_BOOT Figure 8. SW2 boot from external flash SW2 = 2-3 Boot from external flash STR720 SW2 EXT_BOOT 13/31 STR720-EVAL 3 Connectors 3 3.1 Connectors USB Figure 9. USB-B connector: CN3 USB-B Table 8. Pin 1 2 3 4 USB-B connector pinout: CN3 Description VBUS DM DP GND 3.2 CAN bus connector Figure 10. CAN connector 9 pin male D-type: CN4 1 CAN - data 2 3 4 5 6 7 8 9 Table 9. Pin 1 2 3 CAN connector pinout: CN4 Description Not connected Pin 4 Description Not connected Not connected GROUND Pin 7 8 9 Description CAN H, high side bus output Pull down to GROUND Pull up to +3V3 CAN L, low side bus output 5 Ground 6 14/31 3 Connectors STR720-EVAL 3.3 RS232 serial data connector 9-pin general purpose D-type male connectors Figure 11. RS232 transmit and receive connectors: CN7, CN8 RS232 - Data A 1 2 3 4 5 1 RS232 - Data B 2 3 4 5 6 7 8 9 6 7 8 9 Table 10. Pin 1 2 3 RS232 connector pinout: CN7, CN8 Pin 4 5 Description Shorted to pin 1 and 6 GROUND Shorted to pin 1 and 4 Pin 7 8 9 Description Shorted to pin 8 Shorted to pin 7 Not connected Description Shorted to pin 4 and 6 R1IN (port A), R2IN (port B) T1OUT (port A), T2OUT (port B) 6 3.4 Debug Figure 12. JTAG standard interface: CN9 Debug-JTAG port 19 17 15 13 11 97531 20 18 16 14 12 10 8642 Table 11. Pin JTAG interface pinout: CN9 Description GROUND VTref+3.3 V Vsupply +3.3 V notTRST TDI TMS Pin 9 11 13 15 17 19 Description TCK RTCK (GROUND) TD0 notReset DBGRQS pulled low DBGACK pulled low 4, 6, 8, 10, 12, 14, 16, 18, 20 1 2 3 5 7 15/31 STR720-EVAL 3 Connectors 3.5 ATAPI interface Figure 13. ATAPI interface: CN3 39 37 35 33 31 29 27 25 23 21 19 17 15 13 11 9 7 5 3 1 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 Viewed from above board Table 12: ATAPI interface connector: CN3 Pin 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 notRESET ddata7 ddata6 ddata5 ddata4 ddata3 ddata2 ddata1 ddata0 ground dmarq notDIOW not_DIOR iordy not_DMACK intrq DA1 DA0 notCS0 notDASP Assignment 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 Pin ground ddata8 ddata9 ddata10 ddata11 ddata12 ddata13 ddata14 ddata15 reserved ground ground ground spsync_csel ground not_IOCS16 pdiag DA2 notCS1 ground Assignment 16/31 3 Connectors STR720-EVAL 3.6 ADC input Figure 14. ADC input connector: CN4 ADC input 7 5 3 1 8 6 4 2 Table 13. Pin 1 2 3 4 ADC interface pinout: CN4 Description ANA0 Variable resistor output ANA1 Temperature sensor output Pin 5 6 7 8 Description ANA2 GROUND ANA3 GROUND 17/31 STR720-EVAL 4 Schematics 4 4.1 Schematics STR720-EVAL board top sheet 1 of 2 18/31 4 Schematics STR720-EVAL 4.2 STR720-EVAL board top sheet 2 of 2 19/31 STR720-EVAL 4 Schematics 4.3 STR720-EVAL board - SMI SDRAM 20/31 4 Schematics STR720-EVAL 4.4 STR720-EVAL board - EMI 21/31 STR720-EVAL 4 Schematics 4.5 STR720-EVAL board - EMI ATAPI interface 22/31 4 Schematics STR720-EVAL 4.6 STR720-EVAL board - EMI flash 23/31 STR720-EVAL 4 Schematics 4.7 STR720-EVAL board - EMI LCD 24/31 4 Schematics STR720-EVAL 4.8 STR720-EVAL board - ARM JTAG interface 25/31 STR720-EVAL 4 Schematics 4.9 STR720-EVAL board - USB interface 26/31 27/31 4.10 STR720-EVAL board - CAN interface 4 Schematics Caution: the CAN interface is not to be used in industrial applications, see the "STR720 Hardware Development Getting Started Guide AN1907. STR720-EVAL STR720-EVAL 4 Schematics 4.11 STR720-EVAL board - serial flash interfaces 28/31 4 Schematics STR720-EVAL 4.12 STR720-EVAL board - RS232 interface 29/31 STR720-EVAL 5 Revision history 5 Revision history Date 26-September-2005 4-October-2005 Revision 1 2 Initial external release. Page 1 - Updated image. Figure 2: STR720-EVAL board system block diagram on page 6 correction. Section 2.3: Debug on page 7 - correction. Section 2.8: USB full speed interface on page 8 - correction to SDRAM and LCD. Section 2.8: USB full speed interface on page 8 - rephrased. Section 2.9: CAN interface on page 8 - expanded and added caution. Section 2.15: Option switch settings on page 12 - correction to SW2. Section 3.4: Debug on page 15 - clarification for even pins. Chapter 4: Schematics updated revision and Section 4.9: STR720Eval board - USB interface on page 26 and Section 4.10: STR720Eval board - CAN interface on page 27 detail design changes. Section 4.1: STR720-EVAL board top sheet 1 of 2 on page 18 is updated with ClkVref pin19 connected to +1.8 V including decoupling cap. Removed list of third party vendors from the description. Changes 30/31 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. 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