RX610 Group
22. I
2
C Bus Interface (RIIC)
R01UH0032EJ0120 Rev.1.20
Page 698 of 1006
Feb 20, 2013
BBSY Flag (Bus Busy Detection)
The BBSY flag indicates whether the I
2
C bus is occupied (bus busy) or released (bus free).
This bit is set to 1 when the SDAn line changes from high to low under the condition of SCLn = high, assuming that a
start condition has been issued.
When the SDAn line changes from low to high under the condition of SCLn = high, this bit is cleared to 0 after the bus
free time (specified in ICBRL) start condition is not detected, assuming that a stop condition has been issued.
[Setting condition]
•
When a start condition is detected
[Clearing conditions]
•
When the bus free time (specified in ICBRL) start condition is not detected after detecting a stop condition
•
When 1 is written to the IICRST bit in ICCR1 with the ICE bit in ICCR1 set to 0 (RIIC reset)