Usage Of Pec Calculation Module - Renesas H8S/2100 Series Hardware Manual

Table 18.3 SMBus 2.0 Data Format Symbols
Legend
S Start condition
The master device drives SDA from high to low while SCL is high.
SLA Slave address
The master device selects the slave device.
R/W Indicates the direction of data transfer: from the slave device to the master device
when R/W is 1, or from the master device to the slave device when R/W is 0.
A Acknowledge
The receiving device drives SDA low to acknowledge a transfer. (The slave device
returns acknowledge in master transmit mode, and the master device returns
acknowledge in master receive mode.)
DATA Transferred data
PEC PEC data
P Stop condition
The master device drives SDA from low to high while SCL is high.
18.4.2

Usage of PEC Calculation Module

PEC calculation is performed by simply writing to PECX and PECY. The result of calculation is
read from PECZ.
Use the following procedure to perform PEC calculation in SMBUS data transfer.
Section 18 SMBus 2.0 Interface (SMBUS)
Rev. 1.00 May 09, 2008 Page 551 of 954
REJ09B0462-0100