3 shutdown mode register – Rainbow Electronics AT91CAP9S250A User Manual
Page 124
124
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
19.6.3
Shutdown Mode Register
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 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
–
–
–
–
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