RL78/G1P
CHAPTER 12 SERIAL INTERFACE IICA
R01UH0895EJ0100 Rev.1.00
504
Nov 29, 2019
(2) When communication reservation function is disabled (bit 0 (IICRSVn) of IICA flag register n (IICFn) = 1)
When bit 1 (STTn) of IICA control register n0 (IICCTLn0) is set to 1 when the bus is not used in a communication
during bus communication, this request is rejected and a start condition is not generated. The following two
statuses are included in the status where bus is not used.
When arbitration results in neither master nor slave operation
When an extension code is received and slave operation is disabled (ACK is not returned and the bus was
released by setting bit 6 (LRELn) of the IICCTLn0 register to 1 and saving communication)
To confirm whether the start condition was generated or request was rejected, check STCFn (bit 7 of the IICFn
register). It takes up to 5 clocks until the STCFn bit is set to 1 after setting STTn = 1. Therefore, secure the time
by software.
Remark
n = 0, 1