Renesas H8S/2100 Series Hardware Manual page 531

Bit Bit Name
2 BBSY
0 SCP
Note: * The value in BBSY flag does not change even if written.
Initial
Value R/W Description
0 R/W* Bus Busy
1 W Start Condition/Stop Condition Prohibit
In master mode:
•
•
In slave mode:
•
[BBSY setting condition]
•
[BBSY clearing condition]
•
To issue a start/stop condition, use the MOV
instruction.
The I
mode before the issue of a start condition. Set MST to
1 and TRS to 1 before writing 1 in BBSY and 0 in SCP.
The BBSY flag can be read to check whether the I
bus (SCL, SDA) is busy or free.
The SCP bit is always read as 1. If 0 is written, the data
is not stored.
Writing 0 in BBSY and 0 in SCP: A stop condition is
issued
Writing 1 in BBSY and 0 in SCP: A start condition
and a restart condition are issued
Writing to the BBSY flag is disabled.
When the SDA level changes from high to low
under the condition of SCL = high, assuming that
the start condition has been issued.
When the SDA level changes from low to high
under the condition of SCL = high, assuming that
the stop condition has been issued.
2
C bus interface must be set in master transmit
Rev. 1.00 May 09, 2008 Page 505 of 954
2
Section 17 I C Bus Interface (IIC)
REJ09B0462-0100
2
C