RL78/G10 CHAPTER 13 SERIAL INTERFACE IICA
R01UH0384EJ0311 Rev. 3.11 458
Dec 22, 2016
An example of the processing procedure of the slave with the INTIICA0 interrupt is explained below (processing is
performed assuming that no extension code is used). The INTIICA0 interrupt checks the status, and the following
operations are performed.
<1> Communication is stopped if the stop condition is issued.
<2> If the start condition is issued, the address is checked and communication is completed if the address does
not match. If the address matches, the communication mode is set, wait is cancelled, and processing returns
from the interrupt (the ready flag is cleared).
<3> For data transmit/receive, only the ready flag is set. Processing returns from the interrupt with the I
2
C bus
remaining in the wait state.
Remark <1> to <3> above correspond to <1> to <3> in Figure 13-30 Slave Operation Flowchart (2).
Figure 13-30. Slave Operation Flowchart (2)
Yes
Yes
Yes
No
No
No
INTIICA0 generated
Set ready flag
Interrupt servicing completed
SPD0 = 1?
STD0 = 1?
COI0 = 1?
Communication direction flag
← TRC0
Set communication mode flag
Clear ready flag
Clear communication direction
flag, ready flag, and
communication mode flag
<1>
<2>
<3>
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