Datasheet

SAM4S Series [DATASHEET]
Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14
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25.7 Register Write Protection
To prevent any single software error from corrupting MATRIX behavior, certain registers in the address space can
be write-protected by setting the WPEN bit in the “Write Protection Mode Register” (MATRIX_WPMR).
If a write access to a write-protected register is detected, the WPVS flag in the “Write Protection Status Register”
(MATRIX_WPSR) is set and the field WPVSRC indicates the register in which the write access has been
attempted.
The WPVS bit is automatically cleared after reading MATRIX_WPSR.
The following registers can be write-protected:
 “Bus Matrix Master Configuration Registers”
 “Bus Matrix Slave Configuration Registers”
 “Bus Matrix Priority Registers For Slaves”
 “System I/O Configuration Register”