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
1110
0
0 X
A master START was gener-
ated.
Load slave address + R/W into
SMB0DAT.
0
0 X
1100
A master data or address byte Set STA to restart transfer.
1
0 X
1110
0
0
0 was transmitted; NACK
received.
Abort transfer.
0
1 X
Load next data byte into
0
0 X
1100
SMB0DAT.
1100
End transfer with STOP. 0
A master data or address byte End transfer with STOP and start 1
1 X
1 X
0
0
1 was transmitted; ACK
another transfer.
received.
Send repeated START. 1
Switch to Master Receiver Mode 0
0 X
0 X
1110
1000
(clear SI without writing new data
to SMB0DAT).
Acknowledge received byte;
0
0
1
1000
Read SMB0DAT.
Send NACK to indicate last byte, 0
1
0
and send STOP.
Send NACK to indicate last byte, 1
1
0
1110
and send STOP followed by
START.
1000
1
0 X
A master data byte was
received; ACK requested.
Send ACK followed by repeated
START.
1
0
1
1110
Send NACK to indicate last byte, 1
0
0
1110
and send repeated START.
Send ACK and switch to Master
0
0
1
1100
Transmitter Mode (write to
SMB0DAT before clearing SI).
Send NACK and switch to Mas-
0
0
0
1100
ter Transmitter Mode (write to
SMB0DAT before clearing SI).
Rev 1.1
147
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