at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 102

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

15.4.1
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
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.
102
31
23
15
–
–
7
AT91SAM9G20 Preliminary
Real-time Timer Mode Register
30
22
14
–
–
6
29
21
13
–
–
5
16
.
28
20
12
–
–
4
RTPRES
RTPRES
27
19
11
–
–
3
RTTRST
26
18
10
–
2
RTTINCIEN
25
17
–
9
1
6384B–ATARM–15-Dec-08
ALMIEN
24
16
–
8
0