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Rev. 1.00, 05/04, page 290 of 544
Bit Bit Name
Initial
Value R/W Description
5
4
MST
TRS
0
0
R/W [MST clearing conditions]
1. When 0 is written by software
2. When lost in bus contention in I
2
C bus format
master mode
[MST setting conditions]
1. When 1 is written by software (for MST clearing
condition 1)
2. When 1 is written in MST after reading MST = 0 (for
MST clearing condition 2)
[TRS clearing conditions]
1. When 0 is written by software (except for TRS
setting condition 3)
2. When 0 is written in TRS after reading TRS = 1 (for
TRS setting condition 3)
3. When lost in bus contention in I
2
C bus format
master mode
[TRS setting conditions]
1. When 1 is written by software (except for TRS
clearing condition 3)
2. When 1 is written in TRS after reading TRS = 0 (for
TRS clearing condition 3)
3. When 1 is received as the R/W bit after the first
frame address matching in I
2
C bus format slave
mode
3 ACKE 0 R/W Acknowledge Bit Decision and Selection
0: The value of the acknowledge bit is ignored, and
continuous transfer is performed. The value of the
received acknowledge bit is not indicated by the
ACKB bit in ICSR, which is always 0.
1: If the received acknowledge bit is 1, continuous
transfer is halted.
Depending on the receiving device, the acknowledge bit
may be significant, in indicating completion of
processing of the received data, for instance, or may be
fixed at 1 and have no significance.