AR1100 Datasheet, PDF (25/58 Pages) Microchip Technology – AR1100 Resistive USB and RS-232 Touch Screen Controller

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER
6.0 CONFIGURATION REGISTERS
TABLE 6-1: CONFIGURATION REGISTER SUMMARY
ADDR
NAME
DECRIPTION
7
6
5
4 32 1
0 DFLT
0x00 RisetimeCapTime- *170 usec
out
Value of: 0-255
0x18
0x01 RisetimeQuick *10 usec
Value of: 0-255
0x02
0x02 TouchThreshold 8-bit ADC –
touch_check()
Value of: 0-255
0x80
0x03 SensitivityFilter 8-bit ADC
Value of: 0-255
0x04
0x04 SamplingFast
# of ADC samples/touch
to average
Value of: 1, 2, 4, 8, 16, 32, 64, 128
0x04
0x05 SamplingSlow
# of ADC samples/touch
to average
Value of: 1, 2, 4, 8, 16, 32, 64, 128
0x08
0x06 AccuracyFilterFast # of touch positions to
average
Value of: 1-8
0x08
0x07 AccuracyFilter-
Slow
# of touch positions to
average
Value of: 1-8
0x08
0x08 SpeedThreshold 8-bit ADC (raw touch
coordinates)
Value of: 0-255
0x03
0x09 DitherFilter
size of anti-dithering win-
dow 1/4096 of sensor
dim.
Value of: 0-255
0x00
0x0A SleepDelay
*250 msec
Value of: 0-255
0x00
0x0B PenUpDelay
touch process loop count
Value of: 0-255
0x02
0x0C TouchMode
(Note 3)
PD2 PD1 PD0 PM1 PM0 PU2 PU1 PU0 0xB1
0x0D TouchOptions
(Note 1)
TEN VCF — C DRT — 48W CALE 0x89
0x0E CalibrationInset
2x % sensor dimension -
units: 1/256 (e.g.
64=25%)
Value of: 1-128
0x40
0x0F PenStateReport- *170 usec
Delay
Value of: 0-255
0x04
0x10 Reserved
—
—
0x00
0x11 TouchReportDelay *0.5 msec
Value of: 0-255
0x00
0x12 RisetimeDefault *21 usec
Value of: 0-255
0x80
0x13
RisetimeModifier
(value-128) * 10 usec
(i.e., 128 = 0, 127 = -1,
129 = +10)
Value of: 0-255
0x80
0x14 Status
(Note 2)
TCH EEV CALV JMP DRT 8W 5W 4W 0x00
K
0x15 Debug
(Note 4)
— — — RT RTC RTR — — 0x00
Note 1:
2:
3:
4:
OPTIONS/FLAGS: TEN (Touch Enable); VCF (Verbose Cal Feedback); DRT (Dynamic Risetime Enable);
48W (0 = 4-Wire, 1 = 8-Wire); CALE (Calibration Enable);
STATUS (READ ONLY): TCHK (Result of Touch CHK DIAG); EEV (Params in EEPROM used); CALV
(Calibration valid); JMP (State of mode Jumper); DRT (DYN RISE TIME CAP MEAS’D); 8W (Configured
for 8W Sensor); 5W (Configured for 5W Sensor); 4W (Configured for 4W Sensor);
TOUCH MODE(S) (specified for each event: PD, PM and PU): 0: no report(s) issued; 1: report (P = 0); 2:
report (P = 1); 3: report (P = 1), report (P = 0); 4: report (P = 0), report (P = 1); report (P = 0), 5: report (P
= 0), report (P = 1);
DEBUG FLAGS (optional): RT (Risetime Report); RTC (Risetime CAP Report); RTR (Risetime RES
Report).
 2011 Microchip Technology Inc.
DS41606B-page 25