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TC1321 Datasheet(PDF) 7 Page - Microchip Technology |
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TC1321 Datasheet(HTML) 7 Page - Microchip Technology |
7 / 16 page © 2002 Microchip Technology Inc. DS21387B-page 7 TC1321 FIGURE 3-1: SMBus PROTOCOLS S Address R/W ACK Command ACK Data ACK P 8-Bits 0 0 0 0 1 1 1 1 7-Bits 8-Bits Slave Address Command Byte: selects which register you are writing to. Data Byte: data goes into the register set by the command byte. Write 1-Byte Format S Address R/W ACK Command ACK Data ACK Data ACK P 8-Bits 7-Bits 8-Bits 8-Bits Slave Address Command Byte: selects which register you are writing to. Data Byte: data goes into the register set by the command byte. Write 2-Byte Format Read 1-Byte Format S Address R/W ACK Command ACK S Address R/W ACK Data NACK P 7-Bits 8-Bits 7-Bits 8-Bits Slave Address Command Byte: selects which register you are reading from. Slave Address: repeated due to change in data flow direction. Data Byte: reads from the register set by the command byte. Read 2-Byte Format S Address R/W ACK Command ACK S Address R/W ACK Data ACK NACK P Data 7-Bits 8-Bits 7-Bits 8-Bits 8-Bits Slave Address Command Byte: selects which register you are reading from. Slave Address: repeated due to change in data flow direction. Data Byte: reads from the register set by the command byte. Receive 1-Byte Format S Address R/W ACK Data NACK NACK P 7-Bits 8-Bits Data Byte: reads data from the register commanded by the last read byte or write byte transmission. S = START Condition P = STOP Condition Shaded = Slave Transmission Receive 1-Byte Format S Address R/W ACK Data Data ACK P 7-Bits 8-Bits 8-Bits Data Byte: reads data from the register commanded by the last read byte or write byte transmission. S = START Condition P = STOP Condition Shaded = Slave Transmission |
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