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C8051T610/1/2/3/4/5/6/7
Table 22.4. SMBus Status Decoding
Values Read
Current SMbus State
Typical Response Options
Values to
Write
0
0
0
A slave byte was transmitted; No action required (expecting
NACK received. STOP condition).
0
0 X
0001
0100
0
0
1
A slave byte was transmitted; Load SMB0DAT with next data
ACK received. byte to transmit.
0
0 X
0100
0
1 X
A Slave byte was transmitted; No action required (expecting
error detected. Master to end transfer).
An illegal STOP or bus error
0
0
0 X
0 X
0001
—
0101
0 X X was detected while a Slave
Transmission was in progress.
Clear STO.
If Write, Acknowledge received
0
0
1
0000
address
1
0 X
A slave address + R/W was
received; ACK requested.
If Read, Load SMB0DAT with
data byte; ACK received address
0
0
1
0100
NACK received address.
0
0
0
—
0010
Lost arbitration as master;
If Write, Acknowledge received
address
If Read, Load SMB0DAT with
0
0
0
0
1
1
0000
0100
1
1 X slave address + R/W received;
data byte; ACK received address
ACK requested.
NACK received address. 0
0
0
—
Reschedule failed transfer;
1
0
0
1110
NACK received address.
0001
0
A STOP was detected while
0 X addressed as a Slave Trans-
mitter or Slave Receiver.
Clear STO.
0
0 X
—
1
1 X
Lost arbitration while attempt- No action required (transfer
ing a STOP. complete/aborted).
0
0
0
—
0000
1
0 X
A slave byte was received;
ACK requested.
Acknowledge received byte;
Read SMB0DAT.
NACK received byte.
0
0
0
0
1
0
0000
—
Reschedule failed transfer.
0010
0
1 X
Lost arbitration while attempt- Abort failed transfer.
ing a repeated START.
0
1
0 X
0 X
—
1110
0001
0
1 X
Lost arbitration due to a
detected STOP.
Abort failed transfer.
Reschedule failed transfer.
0
1
0 X
0 X
—
1110
Reschedule failed transfer.
0000
1
1 X
Lost arbitration while transmit- Abort failed transfer.
ting a data byte as master.
0
1
0
0
0
0
—
1110
148
Rev 1.1
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