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RL78/G1A CHAPTER 13 SERIAL INTERFACE IICA
13.3.4 IICA flag register 0 (IICF0)
This register sets the operation mode of I
2
C and indicates the status of the I
2
C bus.
The IICF0 register can be set by a 1-bit or 8-bit memory manipulation instruction. However, the STT0 clear flag (STCF)
and I
2
C bus status flag (IICBSY) bits are read-only.
The IICRSV bit can be used to enable/disable the communication reservation function.
The STCEN bit can be used to set the initial value of the IICBSY bit.
The IICRSV and STCEN bits can be written only when the operation of I
2
C is disabled (bit 7 (IICE0) of IICA control
register 00 (IICCTL00) = 0). When operation is enabled, the IICF0 register can be read.
Reset signal generation clears this register to 00H.
R01UH0305EJ0200 Rev.2.00 581
Jul 04, 2013