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17.3.9
IIC Operation Reservation Adapter Status Register B (ICSRB)
ICSRB monitors operating state transitions and error status of the IIC operation reservation
adapter.
Bit
Bit Name
Initial Value
7
CREQ
0
6
CERR
0
R/W
Description
R/(W) * Operation Reservation Command Write Request
Interrupt Flag
0: No command write request is generated
1: Command write request is generated
[Clearing conditions]
•
When ICCMD is read from or written to
•
When 0 is written to CREQ after reading CREQ = 1
[Setting condition]
CREQ Generation Source
Automatic command transition after
slave address match
ACKB = 1 received (NACK = 1) when
the acknowledge bit is enabled in transmit
mode
Stop condition detected (STOPIMX = 0 while
STOP = 1 or ABRT = 1)
Arbitration lost (ALST = 1)
Timeover generated (TOVR = 1)
Undefined command is written
R/(W) * Operation Reservation Command Error Flag
0: No command error is generated
1: Command error is generated
[Clearing conditions]
•
When ICCMD is written to
•
When 0 is written to CERR after reading CERR = 1
[Setting conditions]
•
When arbitration loss is generated
•
When a timeover is generated
•
When a start/stop condition is detected during
transfer
•
When NAK is received
2
Section 17 I
C Bus Interface (IIC)
Rev. 3.00 Jan 25, 2006 page 499 of 872
Generation Timing
Rise of 9th clock
Rise of 9th clock
Stop condition detected
Always
Always
Always
REJ09B0286-0300
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