Datasheet

82
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
13.9 Write Protection Registers
To prevent any single software error that may corrupt AIC behavior, the registers listed below can be write-protected by
setting the WPEN bit in the AIC Write Protect Mode Register (AIC_WPMR).
If a write access in a write-protected register is detected, then the WPVS flag in the AIC Write Protect Status Register
(AIC_WPSR) is set and the WPVSRC field indicates in which register the write access has been attempted.
The WPVS flag is automatically reset after reading the AIC Write Protect Status Register.
The protected registers are:
 “AIC Source Mode Register” on page 84
 “AIC Source Vector Register” on page 85
 “AIC Spurious Interrupt Vector Register” on page 97
 “AIC Debug Control Register” on page 98