Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD Hoja De Datos

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SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

SYSC_WPMR

Read-write 

0: The Write Protection is disabled.

1: The Write Protection is enabled.

If a value is written in WPEN, the value is taken into account only if WPKEY is written with “RTC” (RTC written in ASCII Code, i.e. 
0x525443 in hexadecimal).

List of the write-protected registers:

RSTC Mode Register

RTT Mode Register

RTT Alarm Register

RTC Control Register

RTC Mode Register

RTC Time Alarm Register

RTC Calendar Alarm Register

General Purpose Backup Registers

SUPC Control Register

SUPC Supply Monitor Mode Register

SUPC Mode Register

SUPC WakeUp Mode Register

SUPC WakeUp Input Mode Register

31

30

29

28

27

26

25

24

WPKEY

23

22

21

20

19

18

17

16

WPKEY

15

14

13

12

11

10

9

8

WPKEY

7

6

5

4

3

2

1

0

WPEN