Atmel Evaluation Kit for the SAM4E Series of Flash Microcontrollers ATSAM4E-EK ATSAM4E-EK Hoja De Datos

SAM4E [DATASHEET]

Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14

326

RTT_MR

0x400E1830

Access: Read/Write



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.



0: The bit ALMS in RTT_SR has no effect on interrupt.

1: The bit ALMS in RTT_SR asserts interrupt. 



0: The bit RTTINC in RTT_SR has no effect on interrupt.

1: The bit RTTINC in RTT_SR asserts interrupt.



0: No effect.

1: Reloads and restarts the clock divider with the new programmed value. This also resets the 32-bit counter.



0: The real-time timer is enabled.

1: The real-time timer is disabled (no dynamic power consumption).

Note: RTTDIS is write only.



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