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Section 18 I
C Bus Interface (IIC)
12. The IRIC flag is set to 1 in either of the following cases.
(1) At the fall of the 8th receive clock pulse for one frame
SCL is automatically fixed low in synchronization with the internal clock until the IRIC
flag is cleared.
(2) At the rise of the 9th receive clock pulse for one frame
The IRTR and ICDRF flags are set to 1, indicating that one frame of data has been
received.
13. Read the IRTR flag in ICSR.
If the IRTR flag is 0, execute step [14] to clear the IRIC flag to 0 to release the wait state.
If the IRTR flag is 1 and data reception is complete, execute step [15] to issue the stop
condition.
14. If IRTR flag is 0, clear the IRIC flag to 0 to release the wait state.
Execute step [12] to read the IRIC flag to detect the end of reception.
15. Clear the WAIT bit in ICMR to cancel the wait mode.
Clearing of the IRIC flag should be done while WAIT = 0. (If the WAIT bit is cleared to 0
after clearing the IRIC flag and then an instruction to issue a stop condition is executed, the
stop condition may not be issued correctly.)
16. Read the last ICDR receive data.
17. Clear the BBSY bit and SCP bit to 0 in ICCR. This changes SDA from low to high when SCL
is high, and generates the stop condition.
Rev. 1.00 Mar. 12, 2008 Page 630 of 1178
REJ09B0403-0100
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