Datasheet

679
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
33.8.5 Write Protected Registers
To prevent any single software error that may corrupt CAN behavior, the registers listed below can be write-
protected by setting the WPEN bit in the CAN Write Protection Mode Register (CAN_WPMR).
If a write access in a write-protected register is detected, then the WPVS flag in the CAN Write Protection Status
Register (CAN_WPSR) is set and the field WPVSRC indicates in which register the write access has been
attempted.
The WPVS flag is automatically reset after reading the CAN_WPSR.
List of the write-protected registers:
Section 33.9.1 “CAN Mode Register” on page 681
Section 33.9.6 “CAN Baudrate Register” on page 692
Section 33.9.14 “CAN Message Mode Register” on page 700
Section 33.9.15 “CAN Message Acceptance Mask Register” on page 701
Section 33.9.16 “CAN Message ID Register” on page 702