Preliminary C8051F120/1/2/3 C8051F124/5/6/7 - KEMT FEI TUKE

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C8051F120/1/2/3 C8051F124/5/6/7 Preliminary Table 19.1. SMB0STA Status Codes and States Mode Status Code SMBus State Typical Action MT/ MR 0x08 START condition transmitted. Load SMB0DAT with Slave Address + R/W. Clear STA. 0x10 Repeated START condition transmitted. Load SMB0DAT with Slave Address + R/W. Clear STA. 0x18 Slave Address + W transmitted. ACK received. Load SMB0DAT with data to be transmitted. Master Transmitter 0x20 0x28 Slave Address + W transmitted. NACK received. Data byte transmitted. ACK received. 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. 0x30 Data byte transmitted. NACK received. 1) Retry transfer OR 2) Set STO. 0x38 Arbitration Lost. Save current data. Master Receiver 0x40 Slave Address + R transmitted. ACK received. If only receiving one byte, clear AA (send NACK after received byte). Wait for received data. 0x48 Slave Address + R transmitted. NACK received. Acknowledge poll to retry. Set STO + STA. 0x50 Data byte received. ACK transmitted. Read SMB0DAT. Wait for next byte. If next byte is last byte, clear AA. 0x58 Data byte received. NACK transmitted. Set STO. Page 236 DS008-0.8-AUG02 © 2002 Cygnal Integrated Products, Inc.
Preliminary C8051F120/1/2/3 C8051F124/5/6/7 Table 19.1. SMB0STA Status Codes and States Mode Status Code SMBus State Typical Action 0x60 Own slave address + W received. ACK transmitted. Wait for data. 0x68 Arbitration lost in sending SLA + R/W as master. Own address + W received. ACK transmitted. Save current data for retry when bus is free. Wait for data. Slave Receiver 0x70 0x78 General call address received. ACK transmitted. Arbitration lost in sending SLA + R/W as master. General call address received. ACK transmitted. Wait for data. Save current data for retry when bus is free. 0x80 Data byte received. ACK transmitted. Read SMB0DAT. Wait for next byte or STOP. 0x88 Data byte received. NACK transmitted. Set STO to reset SMBus. 0x90 0x98 Data byte received after general call address. ACK transmitted. Data byte received after general call address. NACK transmitted. Read SMB0DAT. Wait for next byte or STOP. SetSTOtoresetSMBus. 0xA0 STOP or repeated START received. No action necessary. 0xA8 Own address + R received. ACK transmitted. Load SMB0DAT with data to transmit. Slave Transmitter Slave All 0xB0 Arbitration lost in transmitting SLA + R/W as master. Own address + R received. ACK transmitted. Save current data for retry when bus is free. Load SMB0DAT with data to transmit. 0xB8 Data byte transmitted. ACK received. Load SMB0DAT with data to transmit. 0xC0 Data byte transmitted. NACK received. Wait for STOP. 0xC8 Last data byte transmitted (AA=0). ACK received. SetSTOtoresetSMBus. 0xD0 SCL Clock High Timer per SMB0CR timed out Set STO to reset SMBus. 0x00 Bus Error (illegal START or STOP) Set STO to reset SMBus. 0xF8 Idle State does not set SI. © 2002 Cygnal Integrated Products, Inc. DS008-0.8-AUG02 Page 237
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Preliminary C8051F120/1/2/3 C8051F124/5/6/7 - KEMT FEI TUKE

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