Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet

SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

528

CKGR_MOR

0x400E0420

Read/Write 

This register can only be written if the WPEN bit is cleared in 

A crystal must be connected between XIN and XOUT.
0: The Main Crystal Oscillator is disabled.
1: The Main Crystal Oscillator is enabled. MOSCXTBY must be set to 0.
When MOSCXTEN is set, the MOSCXTS flag is set once the Main Crystal Oscillator start-up time is achieved.

0: No effect.
1: The Main Crystal Oscillator is bypassed. MOSCXTEN must be set to 0. An external clock must be connected on XIN.
When MOSCXTBY is set, the MOSCXTS flag in PMC_SR is automatically set.
Clearing MOSCXTEN and MOSCXTBY bits allows resetting the MOSCXTS flag.

0: No effect.
1: Enters the device in Wait Mode.

Note: The WAITMODE bit is write-only.

0: The Main On-Chip RC Oscillator is disabled.
1: The Main On-Chip RC Oscillator is enabled.
When MOSCRCEN is set, the MOSCRCS flag is set once the Main On-Chip RC Oscillator start-up time is achieved.

31

30

29

28

27

26

25

24

–

–

–

–

–

–

CFDEN

MOSCSEL

23

22

21

20

19

18

17

16

KEY

15

14

13

12

11

10

9

8

MOSCXTST

7

6

5

4

3

2

1

0

–

MOSCRCF

MOSCRCEN

WAITMODE

MOSCXTBY

MOSCXTEN