Atmel SAM9X25, Manual

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SAM9X25
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11054A–ATARM–27-Jul-11
SAM9X25
18.7.2 Shutdown Mode Register
Name: SHDW_MR
Address: 0xFFFFFE14
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.
• RTCWKEN: Real-time Clock Wake-up Enable
0 = The RTC Alarm signal has no effect on the Shutdown Controller.
1 = The RTC 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
– – – – – – RTCWKEN –
15 14 13 12 11 10 9 8
– – – –
7 6 5 4 3 2 1 0
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