Hitachi H8/3692 Manuale Utente
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.
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.
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.
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.
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.
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
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.