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Rev. 1.0, 07/01, page 226 of 372
Bit Bit Name Initial Value R/W Description
6 SCP 1 W Start/Stop Issue Condition Disable
The SCP bit controls the issue of start/stop conditions in
master mode.
To issue a start condition, write 1 in BBSY and 0 in SCP. A
retransmit start condition is issued in the same way. To
issue a stop condition, write 0 in BBSY and 0 in SCP. This
bit is always read as 1. If 1 is written, the data is not stored.
5 SDAO 1 R/W SDA Output Value Control
This bit is used with SDAOP when modifying output level of
SDA. This bit should not be manipulated during transfer.
0: When reading, SDA pin outputs low.
When writing, SDA pin is changed to output low.
1: When reading, SDA pin outputs high.
When writing, SDA pin is changed to output Hi-Z
(outputs high by external pull-up resistance).
4 SDAOP 1 R/W SDAO Write Protect
This bit controls change of output level of the SDA pin by
modifying the SDAO bit. To change the output level, clear
SDAO and SDAOP to 0 or set SDAO to 1 and clear
SDAOP to 0 by the MOV instruction. This bit is always read
as 1.
3 SCLO 1 R This bit monitors SCL output level. When SCLO is 1, SCL
pin outputs high. When SCLO is 0, SCL pin outputs low.
2 1 Reserved
This bit is always read as 1, and cannot be modified.
1 IICRST 0 R/W IIC Control Part Reset
This bit resets the control part except for I
2
C registers. If
this bit is set to 1 when hang-up occurres because of
communication failure during I
2
C operation, I
2
C control part
can be reset without setting ports and initializing registers.
0 1 Reserved
This bit is always read as 1, and cannot be modified.