Specifications

RX62N Group, RX621 Group RIIC Multi-Master Communication

R01AN0630EJ0100 Rev.1.00 Page 4 of 23

Sep 27, 2011

3. Software Description

3.1 Operation Overview

• The program performs master mode transmission. If the arbitration lost state is detected during master mode

transmission, the communication of the other master device is given priority and the program switches to slave

mode operation.

• The program performs master mode reception. If the arbitration lost state is detected during master mode reception,

the communication of the other master device is given priority and the program switches to slave mode operation.

• If the slave address matches during slave mode operation, a slave reception or transmission operation is started

according to the state of the R/W# bit.

• A callback function is called when slave mode communication completes or when master mode communication

completes.

Table 3 lists the settings for the RIIC module used in this application note.

Table 3 RIIC Settings

Item Description

Channel Channel 0

Master/slave operation Master transmission, master reception, slave reception, slave transmission

Address format 7-bit address format

Slave address 0x10

Transmission speed 100 kbps

Arbitration lost detection Master arbitration lost detection

Timeout detection

• Count when the SCL line is low or high

• Long mode (16-bit counter)

Note: Refer to the RX62N Group and RX621 Group Hardware Manual and the I²C bus specifications for

details on the I

C bus communication format.

3.2 File Structure

Table 4 lists the files used for the sample code. The files automatically generated by the integrated development

environment are not listed.

Table 4 File Structure

File Name Function Notes

main.c Main processing

riic.c RIIC control related processing

riic_int.c RIIC interrupt processing

riic.h RIIC related header files

intprg.c File automatically generated by HEW

(Only the RIIC interrupt functions used in this program are deleted.)