AR1100 Datasheet, PDF (21/58 Pages) Microchip Technology – AR1100 Resistive USB and RS-232 Touch Screen Controller

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER
5.0 COMMANDS
In normal operation, the AR1100 automatically returns
‘touch reports’ in response to a touch – no ‘prompting’
is required from the host. The following command set
can be used to configure the parameters used to
‘fine-tune’ the operation. To prevent touch reports from
interfering with these commands, it is recommended
that TOUCH_DISABLE be executed prior to any other
command(s) and the TOUCH_ENABLE command be
used as the last step to return the AR1100 to normal
operation.
5.1 Summary
Table 5-1 summarizes the standard command set.
TABLE 5-1: COMMAND SUMMARY
CMND
NAME
0x12
0x13
0x14
0x20
0x21
0x28
0x29
0x2B
0x23
TOUCH_ENABLE
TOUCH_DISABLE
CALIBRATE
REG_READ
REG_WRITE
EE_READ
EE_WRITE
EE_READ_PARAMS
EE_WRITE_PARAMS
Table 5-2 summarizes the STATUS byte in the
RESPONSE packet.
TABLE 5-2: STATUS SUMMARY
STATUS
0x00
0x01
0x04
0x05
0xFC
NAME
OK
UNRECOGNIZED
TIMEOUT
EEPARAMS_ERR
CAL_CANCEL
DESCRIPTION
Enable TOUCH reporting
Disable TOUCH reporting
Execute Calibrate routine
Read register(s)
Write register(s)
Read EE location(s)
Write EE location(s)
Read parameter set (from EE to RAM)
Write parameter set (from RAM to EE)
DESCRIPTION
No error
Unrecognized command
Packet time out
Error reading EEPROM parameters
Calibration sequence cancelled
 2011 Microchip Technology Inc.
DS41606B-page 21