Datasheet

RSKRX210 5. User Circuitry

R20UT0302EG0200 Rev. 2.00 Page 16 of 41

Jul 09, 2012

5.7 RS232 Serial Port

Connections between the RS232 header and the microcontroller are listed in Table 5-5 below.

SCI Signal Function MCU Connection RS232 Connection

TXD0 SCI0 Transmit Signal. P20, pin 28 Pin 2

RXD0 SCI0 Receive Signal. P21, pin 27 Pin 3

TXD1 SCI1 Transmit Signal. P26, pin 22 Pin 2*

RXD1 SCI1 Receive Signal. P30, pin 20 Pin 3*

TXD9 SCI9 Transmit Signal. PB7, pin 53 Pin 8*

RXD9 SCI9 Receive Signal. PB6, pin 54 Pin 7*

RS232TX External SCI Transmit Signal. n/a Pin 2*

RS232RX External SCI Receive Signal. n/a Pin 3*

Table 5-5: Serial Port Connections

* This connection is a not available in the default RSK configuration - refer to §6 for the required modifications.

5.8 I

C Bus (Inter-IC Bus)

The RX210 features one I

C (Inter-IC Bus) interface module, which is connected to a 16Kbit EEPROM

(Electronically-Erasable Programmable Read Only Memory). Specific details of the EEPROM device and the

connections can be found in the board schematics.

This EEPROM only supports one concurrent device on a single I2C bus, as it responds to all possible addresses.