Datasheet

Appendix B Internal I/O Registers
Rev. 4.00 Jun 06, 2006 page 914 of 1004
REJ09B0301-0400
ICSR1—I
2
C Bus Status Register 1 H'FF89 IIC1
ICSR0—I
2
C Bus Status Register 0 H'FFD9 IIC0
7
ESTP
0
R/(W)
*
1
6
STOP
0
R/(W)
*
1
5
IRTR
0
R/(W)
*
1
4
AASX
0
R/(W)
*
1
3
AL
0
R/(W)
*
1
0
ACKB
0
R/W
2
AAS
0
R/(W)
*
1
1
ADZ
0
R/(W)
*
1
Bit
Initial value
Read/Write
Acknowledge bit
0 Receive mode: 0 is output at
acknowledge output timing
Transmit mode: indicates that
the receiving device has
acknowledged the data (signal is 0)
1 Receive mode: 1 is output at
acknowledge output timing
Transmit mode: indicates that
the receiving device has not
acknowledged the data (signal is 1)
Notes:
General call address recognition flag
*
2
0
General call address not recognized
1 General call address recognized
Slave address recognition flag
*
2
0 Slave address or general call address
not recognized
1 Slave address or general call address
recognized
Arbitration lost
*
2
0
Bus arbitration won
1 Arbitration lost
Second slave address recognition flag
*
2
0
Second slave address not recognized
1 Second slave address recognized
I
2
C bus interface continuous transmission/reception interrupt request flag
*
2
0
Waiting for transfer, or transfer in progress
1 Continuous transfer state
Normal stop condition detection flag
*
2
0
No normal stop condition
1 In I
2
C bus format slave mode: Normal stop condition detected
In other modes: No meaning
Error stop condition detection flag
*
2
0 No error stop condition
1 In I
2
C bus format slave mode: Error stop condition detected
In other modes: No meaning
1. Only 0 can be written, to clear the flag.
2. For the clearing and setting conditions, see section 16.2.6, I
2
C Bus Status Register (ICSR).