Datasheet

306

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

18.5.9 System Controller Write Protect Mode Register

Name: SYSC_WPMR

Access: Read-write

• WPEN:

0: The Write Protection is disabled.

1: The Write Protection is enabled.

• WPKEY:

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

76543210

WPEN