Datasheet

SAM9G20
DS60001516A-page 116  2017 Microchip Technology Inc.
17.6.2 Shutdown Mode Register
Name:SHDW_MR
Access:Read/Write
WKMODE0: Wake-up Mode 0
CPTWK0: Counter on Wake-up 0
Defines the number of 16 Slow Clock cycles, the level detection on the corresponding input pin shall last before the wake-up event occurs.
Because of the internal synchronization of WKUP0, the SHDN pin is released
(CPTWK x 16 + 1) Slow Clock cycles after the event on WKUP.
RTTWKEN: Real-time Timer Wake-up Enable
0: The RTT Alarm signal has no effect on the Shutdown Controller.
1: The RTT Alarm signal forces the de-assertion of the SHDN pin.
31 30 29 28 27 26 25 24
––––––––
23 22 21 20 19 18 17 16
–––––––RTTWKEN
15 14 13 12 11 10 9 8
CPTWK1 – – –
76543210
CPTWK0 – – WKMODE0
WKMODE[1:0] Wake-up Input Transition Selection
0 0 None. No detection is performed on the wake-up input
0 1 Low to high level
1 0 High to low level
1 1 Both levels change