Renesas H8S/2111B Hardware Manual page 325

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]
When the SDA level changes from high to low under the
condition of SCL = high, assuming that the start condition
has been issued.
[BBSY clearing condition]
When the SDA level changes from low to high under the
condition of SCL = high, assuming that the stop condition
has been issued.
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
(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.
2
C bus interface must be set in master transmit
Rev. 1.00, 05/04, page 291 of 544
2
C bus