SAM9G15_14 Datasheet, PDF (947/1215 Pages) ATMEL Corporation – ARM-based Embedded MPU

41.8.18 ADC Touchscreen Mode Register
Name:
Address:
Access:
ADC_TSMR
0xF804C0B0
Read-write
31
30
29
28
27
26
25
24
PENDBC
–
–
–
PENDET
23
22
21
20
19
18
17
16
–
NOTSDMA
–
–
TSSCTIM
15
14
13
12
11
10
9
8
–
–
–
–
TSFREQ
7
6
5
4
3
2
1
0
–
–
TSAV
–
–
TSMODE
This register can only be written if the WPEN bit is cleared in “ADC Write Protect Mode Register” on page 953.
• TSMODE: Touchscreen Mode
Value
0
1
2
3
Name
NONE
4_WIRE_NO_PM
4_WIRE
5_WIRE
Description
No Touchscreen
4-wire Touchscreen without pressure measurement
4-wire Touchscreen with pressure measurement
5-wire Touchscreen
When TSMOD equals 01 or 10 (i.e. 4-wire mode), channel 0, 1, 2 and 3 must not be used for classic ADC conversions. When
TSMOD equals 11 (i.e. 5-wire mode), channel 0, 1, 2, 3, and 4 must not be used.
• TSAV: Touchscreen Average
Value
0
1
2
3
Name
NO_FILTER
AVG2CONV
AVG4CONV
AVG8CONV
Description
No Filtering. Only one ADC conversion per measure
Averages 2 ADC conversions
Averages 4 ADC conversions
Averages 8 ADC conversions
• TSFREQ: Touchscreen Frequency
Defines the Touchscreen Frequency compared to the Trigger Frequency.
TSFREQ must be greater or equal to TSAV.
The Touchscreen Frequency is:
Touchscreen Frequency = Trigger Frequency / 2^TSFREQ
• TSSCTIM: Touchscreen Switches Closure Time
Defines closure time of analog switches necessary to establish the measurement conditions.
The Closure Time is:
Switch Closure Time = (TSSCTIM * 4) ADCClock periods.
SAM9G15 [DATASHEET]
11152F–ATARM–10-Mar-2014
947