AR1010T-ISLASHML datasheet(27/70 Pages) MICROCHIP

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 2009-2012 Microchip Technology Inc.

Preliminary

DS41393B-page 27

AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER

7.0

TOUCH REPORTING

PROTOCOL

Touch coordinates are sent from the controller to the

host system in a 5-byte data packet, which contains the

X-axis coordinate, Y-axis coordinate, and a “Pen-Up/

Down” touch status.

The range for X-axis and Y-axis coordinates is from 0-

4095 (12-bit). The realized resolution is 1024, and bits

X1:X0 and Y1:Y0 are zeros.

It is recommended that applications be developed to

read the 12-bit coordinates from the packet and use

them in a 12-bit format. This enhances the application

robustness, as it will work with either 10 or 12 bits of

coordinate information.

The touch coordinate reporting protocol is shown below

in Table 7-1.

where:

• P:

0 Pen Up, 1 Pen Down

• R:

Reserved

• X11-X0: X-axis coordinate

• Y11-Y0: Y-axis coordinate

TABLE 7-1:

TOUCH COORDINATE REPORTING PROTOCOL

Byte #

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

X65

X11

X10

Y11

Y10

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