at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 121

• Manufacturer Part Number: at91sam9g20-cu
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

18.6.2
Register Name: SHDW_MR
Access Type: 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
(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
6384B–ATARM–15-Dec-08
31
23
15
–
–
7
0
0
1
1
WKMODE[1:0]
Shutdown Mode Register
30
22
14
–
–
6
0
1
0
1
CPTWK1
CPTWK0
Wake-up Input Transition Selection
None. No detection is performed on the wake-up input
Low to high level
High to low level
Both levels change
29
21
13
–
–
5
28
20
12
–
–
4
SHDN
pin.
27
19
11
–
–
–
3
–
AT91SAM9G20 Preliminary
SHDN
pin is released
26
18
10
–
–
–
2
–
25
17
–
–
9
1
WKMODE0
–
RTTWKEN
24
16
–
8
0
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