AR1100 datasheet(17/58 Pages) MICROCHIP

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 2011 Microchip Technology Inc.

DS41606B-page 17

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

4.2.1.3

Mode: HID-DIGITIZER

Touch report format:

For flexibility, the value and behavior of the ‘tip switch’

data entity (“T”) and touch reporting react to and is

defined by the ‘Touch mode’ parameter (similar to ‘pen

state’ bit in HID-GENERIC or UART).

4.2.2

COMMAND PACKETS

PACKETs are used for all communications, other than

touch reports (i.e., configuration/control). COMMAND

packets (issued by the host) and RESPONSE packets

(issued by the device) have identical framework but dif-

fer slightly in format, as described below. In standard

operation, communication is initiated by the host then

acknowledged by the device. In some diagnostic sce-

narios (not discussed here) – a COMMAND packet

does not necessarily dictate a response from the

device and, in other cases, a RESPONSE packet may

be issued by the device unsolicited.

TABLE 4-5:

TOUCH REPORT FORMAT – DIGITIZER

BYTE

BIT

X4X3X2

X11

X10

Y4Y3Y2

Y11

Y10

Tip switch

Proximity (in range) – always 1

X ordinate of touch location (12 bits)

TABLE 4-6:

TOUCH MODE OPTIONS – DIGITIZER

MODE

SUPPORTED EVENT

BEHAVIOR

NO REPORT

REPORT (T=0)

REPORT (T=1)

REPORT (T=1), REPORT (T=0)

REPORT (T=0), REPORT (T=1), REPORT (T=0)

REPORT (T=0), REPORT (T=1)

Pen down

Pen up

Pen move

Report

Touch report

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