Hitachi H*/3694F-ZTAT User Manual

Rev. 1.0, 07/01, page 226 of 372

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.