Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet
Product codes
ATSAM4S-WPIR-RD
SAM4S Series [DATASHEET]
Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14
290
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
RTPRES = 0: The prescaler period is equal to 2
16
* SLCK period.
RTPRES ≠ 0: The prescaler period is equal to RTPRES * SLCK period.
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.
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.
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.
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).
1: The real-time timer is disabled (no dynamic power consumption).
Note: RTTDIS is write only.
• RTC1HZ: Real-Time Clock 1 Hz 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.
1: The RTT 32-bit counter is driven by the RTC 1 Hz 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