Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Scheda Tecnica

904

SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]

11063K–ATARM–05-Nov-13

ADC_TSMR

0xF804C0B0

Read-write

This register can only be written if the WPEN bit is cleared in 

.

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.

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

Defines closure time of analog switches necessary to establish the measurement conditions. 

The Closure Time is:

Switch Closure Time = (TSSCTIM * 4) ADCClock periods.

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

0

NONE

No Touchscreen

1

4_WIRE_NO_PM

4-wire Touchscreen without pressure measurement

2

4_WIRE

4-wire Touchscreen with pressure measurement

3

5_WIRE

5-wire Touchscreen

0

NO_FILTER

No Filtering. Only one ADC conversion per measure

1

AVG2CONV

Averages 2 ADC conversions

2

AVG4CONV

Averages 4 ADC conversions

3

AVG8CONV

Averages 8 ADC conversions