DS41393A-Page 18

© 2009 Microchip Technology, Inc.

7.14 Command Response

A received command will be responded to as follows.

<Header><DataSize><Response><Command><Data>…<Data>

<Header> is defined as a value of 0x55 and is used to mark the beginning of the response packet.

<DataSize> is the number of bytes being sent in the response packet, after <DataSize>.

<Response> is a returned status to the received command.

Value Description

0x00

Success

0x01

Unrecognized Command

0x03

Unrecognized Header

0x04

Command Timeout (entire command not received within 100ms)

0xFC

Calibration Cancel

<Command> is a confirmation of the command being responded to.

<Data> represent from zero to eight bytes of returned data.

7.15 Commands

Command

Value

Command Description

0x12

Enable Touch

0x13

Disable Touch

0x14

Calibrate Mode

0x20

Register Read

0x21

Register Write

0x22

Register Start Address Request

0x23

Registers Write to Eeprom

0x28

EEPROM Read

0x29

EEPROM Write

0x2B

EEPROM Write to Registers

Table 9 : Command Set Summary

7.15.1 Enable Touch - 0x12

Controller will send touch coordinate reports for valid touch conditions.

Send

: <0x55><0x01><0x12>

Receive : <0x55><0x02><Response><0x12>

7.15.2 Disable Touch - 0x13

Controller will not send any touch coordinate reports. A touch will, however, still wake up the controller if asleep.

Send

: <0x55><0x01><0x13>

Receive : <0x55><0x02><Response><0x13>