Atmel Evaluation Kit for the SAM4E Series of Flash Microcontrollers ATSAM4E-EK ATSAM4E-EK 数据表
产品代码
ATSAM4E-EK
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