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2
Section 18 I
C Bus Interface (IIC)
Bit
Bit Name
2
BBSY
0
SCP
Note:
* Even if the BBSY bit is written to, the value of the flag does not change.
Rev. 1.00 Mar. 12, 2008 Page 600 of 1178
REJ09B0403-0100
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 conditions]
•
To issue a start/stop condition, use the MOV instruction.
The I
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.
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 mode
2
C bus
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