Atmel Evaluation Kit for the SAM4E Series of Flash Microcontrollers ATSAM4E-EK ATSAM4E-EK Datenbogen

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SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
326
15.5.1 Real-time Timer Mode Register
Name:
RTT_MR
Address:
0x400E1830
Access: 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
 * SLCK periods.
RTPRES = 1 or 2: forbidden.
RTPRES 
≠ 0,1 or 2: The prescaler period is equal to RTPRES * SLCK periods.
Note: The RTTINCIEN bit must be cleared prior to writing a new RTPRES value.
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
0: No effect.
1: Reloads and restarts the clock divider with the new programmed value. This also resets the 32-bit counter.
RTTDIS: Real-time Timer Disable
0: The real-time timer is enabled.
1: The real-time timer is disabled (no dynamic power consumption).
Note: RTTDIS is write only.
RTC1HZ: Real-Time Clock 1Hz Clock Selection
0: The RTT 32-bit counter is driven by the 16-bit prescaler roll-over events.
1: The RTT 32-bit counter is driven by the 1Hz RTC clock.
Note: RTC1HZ is write only.
31
30
29
28
27
26
25
24
RTC1HZ
23
22
21
20
19
18
17
16
RTTDIS
RTTRST
RTTINCIEN
ALMIEN
15
14
13
12
11
10
9
8
RTPRES
7
6
5
4
3
2
1
0
RTPRES