EP80579 Datasheet, PDF (919/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
Table 24-31. Quick Protocol
Bit
Description
1
Start Condition
2–8 Slave Address - 7 bits
9
Read / Write Direction
10 Acknowledge from slave
11 Stop
24.4.2.2
Send Byte/Receive Byte
For the send byte command, the Transmit Slave Address and Device Command
Registers are sent.
The Receive Byte is similar to a Send Byte, the only difference is the direction of data
transfer. When programmed for the receive byte command, the Transmit Slave Address
Register is sent. The data received is stored in the DATA0 register. The order sent/
received without PEC is shown in Table 24-32. Send Byte/Receive Byte command with
I2C_EN set produces undefined results. Software must force the I2C_EN bit to 0 when
running this command.
Table 24-32. Send/Receive Byte Protocol without PEC
Send Byte Protocol
Receive Byte Protocol
Bit
Description
1
Start
2 – 8 Slave Address - 7 bits
9
Write
10 Acknowledge from slave
11 – 18 Command code - 8 bits
19 Acknowledge from slave
20 Stop
Bit
Description
1
Start
2 – 8 Slave Address - 7 bits
9
Read
10 Acknowledge from slave
11 – 18 Data byte from slave
19 NOT Acknowledge
20 Stop
The order sent/received, with PEC, is shown in Table 24-33.
Table 24-33. PEC Send/Receive Order
Send Byte Protocol
Bit
Description
1
Start
2 – 8 Slave Address - 7 bits
9
Write
10 Acknowledge from slave
11 – 18 Command code - 8 bits
19 Acknowledge from slave
20 – 27 PEC
28 Acknowledge from slave
29 Stop
Receive Byte Protocol
Bit
Description
1
Start
2 – 8 Slave Address - 7 bits
9
Read
10 Acknowledge from slave
11 – 18 Data byte from slave
19 Acknowledge
20 – 27 PEC from slave
28 Not Acknowledge
29 Stop
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
919