DS41393A-Page 22

© 2009 Microchip Technology, Inc.

7.15.8 EEPROM Read - 0x28

The controller has 256 bytes of on-board EEPROM.



The first 128 bytes (address range 0x00–0x7F) are reserved by the controller for the configuration register

settings and calibration data.



The second 128 bytes (address range 0x80–0xFF) are provided for the user’s application, if desired.

This command provides a means to read values from the EEPROM.

Send

: <0x55><0x04><0x28><EEPROM Address High byte><EEPROM Address Low byte><# of EEPROM to Read>

# of EEPROM to Read

: 0x01 thru 0x08

EEPROM Address High byte : 0x00

Receive : <0x55><0x02 + # EEPROM Read><Response><0x28><EEPROM value>…<EEPROM value>

7.15.9 EEPROM Write - 0x29

The controller has 256 bytes of on-board EEPROM.



The first 128 bytes (address range 0x00–0x7F) are reserved by the controller for the configuration register

settings and calibration data.



The second 128 bytes (address range 0x80–0xFF) are provided for the user’s application, if desired.

This command provides a means to write values to the EEPROM.

Write to EEPROM as follows.

Send: <0x55><0x04 + # EEPROM to Write><0x29><EEPROM Address High byte><EEPROM Address Low byte>

<# of EEPROM to Write><Data>…<Data>

# of EEPROM to Write

: 0x01 thru 0x08

EEPROM Address High byte : 0x00

Receive : <0x55><0x02><Response><0x29>

7.15.10 EEPROM Write to Registers - 0x2B

Write applicable EEPROM data to Configuration Registers. This will cause the controller to immediately begin

using changes made to EEPROM stored Configuration Register values. A power cycle of the controller will

automatically cause the controller to use changes made to the EEPROM stored Configuration Register values,

without the need for issuing this command. This command eliminates the need for the power cycle.

Send

: <0x55><0x01><0x2B>

Receive : <0x55><0x02><Response><0x2B>

Warning: ONLY write to user EEPROM addresses of 0x80–0xFF.

One of the following actions is required for EEPROM changes to be used by the controller.



The controller power must be cycled from OFF to ON

or



Issue the “EEPROM Write to Registers” command