MC908AP16CFAE Datasheet, PDF (245/324 Pages) Freescale Semiconductor, Inc – Table of Contents

SMBus Protocols with PEC and without PEC
14.8 SMBus Protocols with PEC and without PEC
Following is a description of the various MMIIC bus protocols with and without a packet error code (PEC).
14.8.1 Quick Command
1
START
7
11
Slave Address RW ACK
1
STOP
Master to Slave
Start Condition
Stop Condition
Command Bit
Acknowledge
Figure 14-13. Quick Command
Slave to Master
14.8.2 Send Byte
START Slave Address W ACK Command Code ACK
(a) Send Byte Protocol
STOP
START Slave Address W ACK Command Code ACK
PEC
(b) Send Byte Protocol with PEC
Figure 14-14. Send Byte
14.8.3 Receive Byte
ACK STOP
START Slave Address R ACK
(a) Receive Byte Protocol
Data Byte
NAK STOP
START Slave Address R ACK
Data Byte
ACK
PEC
(b) Receive Byte Protocol with PEC
Figure 14-15. Receive Byte
NAK STOP
MC68HC908AP Family Data Sheet, Rev. 4
Freescale Semiconductor
243