Datasheet

119
SAM9261 [DATASHEET]
Atmel-6062O-ATARM-SAM9261-Datasheet_21-Jun-16
16.7.2 Shutdown Mode Register
Name: SHDW_MR
Address: 0xFFFFFD14
Access: Read/Write
• WKMODE0: Wakeup Mode 0
• CPTWK0: Counter on Wakeup 0
Defines the number of 16 Slow Clock cycles, the level detection on the corresponding input pin shall last before the
wakeup 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 Wakeup 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
––––
76543210
CPTWK0 – – WKMODE0
Value Wakeup Input Transition Selection
0 0 None. No detection is performed on the wakeup input
0 1 Low to high level
1 0 High to low level
1 1 Both levels change