1 real-time timer mode register – Rainbow Electronics AT91CAP9S250A User Manual
Page 102
102
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
16.4.1
Real-time Timer Mode Register
Register Name:
RTT_MR
Access Type: Read/Write
• RTPRES: Real-time Timer Prescaler Value
Defines the number of SLCK periods required to increment the Real-time timer. RTPRES is defined as follows:
RTPRES = 0: The prescaler period is equal to 2
16
RTPRES
≠
0: The prescaler period is equal to RTPRES.
• ALMIEN: Alarm Interrupt Enable
0 = The bit ALMS in RTT_SR has no effect on interrupt.
1 = The bit ALMS in RTT_SR asserts interrupt.
• RTTINCIEN: Real-time Timer Increment Interrupt Enable
0 = The bit RTTINC in RTT_SR has no effect on interrupt.
1 = The bit RTTINC in RTT_SR asserts interrupt.
• RTTRST: Real-time Timer Restart
1 = Reloads and restarts the clock divider with the new programmed value. This also resets the 32-bit counter.
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
RTTRST
RTTINCIEN
ALMIEN
15
14
13
12
11
10
9
8
RTPRES
7
6
5
4
3
2
1
0
RTPRES