Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK Data Sheet

 901

SAM9M10 [DATASHEET]

6355F–ATARM–12-Mar-13

Touch Screen Pen Detect 

The Touch Screen Pen Detect can be used to generate a TSADCC interrupt to wake up the system or it can be
programmed to trig a conversion, so that a position can be measured as soon as a contact is detected if the
TSADCC is programmed for an operating mode involving the Touch Screen.

:

• the bit PENCNT is set as soon as a current flows for a time over the debouncing time as defined by PENDBC 

and remains set until TSADCC_SR is read.

• the bit NOCNT is set as soon as no current flows for a time over the debouncing time as defined by PENDBC 

and remains set until TSADCC_SR is read.

Both bits are automatically cleared as soon as the Status Register TSADCC_SR is read, and can generate an
interrupt by writing accordingly the 

.

X

P

X

M

Y

M

VDDANA

Y

P

VDDANA

GND

GND

To the ADC

GND

Pen Interrupt

Debouncer

PENDBC