Table 20.1.Smb0Sta Status Codes And States - Silicon Laboratories C8051F120 Manual

Table 20.1. SMB0STA Status Codes and States
Status
Mode
Code
0x08 START condition transmitted.
0x10 Repeated START condition transmitted.
0x18 Slave Address + W transmitted. ACK
received.
0x20 Slave Address + W transmitted. NACK
received.
0x28 Data byte transmitted. ACK received.
0x30 Data byte transmitted. NACK received.
0x38 Arbitration Lost.
0x40 Slave Address + R transmitted. ACK received.
0x48 Slave Address + R transmitted. NACK
received.
0x50 Data byte received. ACK transmitted.
0x58 Data byte received. NACK transmitted.
C8051F120/1/2/3/4/5/6/7
SMBus State
Rev. 1.2
Typical Action
Load SMB0DAT with Slave Address +
R/W. Clear STA.
Load SMB0DAT with Slave Address +
R/W. Clear STA.
Load SMB0DAT with data to be transmit-
ted.
Acknowledge poll to retry. Set STO +
STA.
1) Load SMB0DAT with next byte, OR
2) Set STO, OR
3) Clear STO then set STA for repeated
START.
1) Retry transfer OR
2) Set STO.
Save current data.
If only receiving one byte, clear AA (send
NACK after received byte). Wait for
received data.
Acknowledge poll to retry. Set STO +
STA.
Read SMB0DAT. Wait for next byte. If
next byte is last byte, clear AA.
Set STO.
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