Atmel SAM4S Xplained Pro Starter Kit Atmel ATSAM4S-XSTK ATSAM4S-XSTK Data Sheet
Product codes
ATSAM4S-XSTK
256
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
15.5.1 Real-time Timer Mode Register
Name:
RTT_MR
Address:
0x400E1430
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
* SCLK period.
RTPRES
≠ 0: The prescaler period is equal to RTPRES * SCLK period.
• 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).
• 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 RTC 1 Hz clock.
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