Fujitsu FR81S ユーザーズマニュアル
CHAPTER 40: MULTI-FUNCTION SERIAL INTERFACE
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : MULTI-FUNCTION SERIAL INTERFACE
FUJITSU SEMICONDUCTOR CONFIDENTIAL
127
Bit name
Function
bit0 BB:
Bus state bit
"0" Read: Bus idle state
"1" Read: Bus transmission/reception state
This bit indicates the bus state.
BB bit set conditions:
(1) When "L" was detected at SDA or SCL on I
2
C bus
BB bit reset conditions:
(1) When a stop condition detected
(2) I
2
C interface disable (ISMK:EN bit="0")
(3) Bus error detected (IBCR:BER bit="1")
MB91520 Series
MN705-00010-1v0-E
1440