AN1775

6 Reference Design

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6.4

CAN interface

A general purpose, asynchronous serial I/O data port connected through a 9-pin D-type male

connector with micro switches selectable between High or Low bus output S702, and between

Standby or Slope control S700.

For more details, refer to CAN transceiver SN65HVD230D datasheet.

6.5

RS232 serial interface

A general purpose, asynchronous serial I/O data ports is connected through 9-pin D-type male

connectors.

RS232 connects directly to UART0, transmit and receive only (null modem).

RTS is shorted to CTS and DTR is shorted to DSR at the connector.

For more details, refer to RS232 transceiver ST3232 datasheet.

6.6

Serial ROM

6.6.1

SPI Flash

1-Mbit SPI serial flash connected to the buffered serial peripheral interface (BSPI). Switch S603

is used to enable or disable write protect (pull down = Write protect, pull up = Write enabled).

For more details, refer to SPI Flash M25P10-A datasheet.

6.6.2

I2C EEPROM:

8-kbit EEPROM connected to the I2C0 interface, Switch S600 is used to enable or disable write

protect (pull down = Write protect, pull up = Write enabled).

For more details, refer to I2C Eeprom M24C08 datasheet.

The values R614 and R616 are dependent on the I2C communication speed.

For more details on theses values, please refer to the STR71x reference manual.

6.7

JTAG interface

Refer to the section Section 5 on page 11.

6.8

SRAM

Two SRAM 2M byte are connected to External Interface Memoy EMI and mapped from 0x6200

0000 to 0x623F FFFF.

For more details, refer to the SRAM memory TC55V8200FT-12 datasheet.