AR1000 Datasheet, PDF (26/37 Pages) Microchip Technology – Resistive Touch Screen Controller

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.
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
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>
DS41393A-Page 22
© 2009 Microchip Technology, Inc.