SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 651

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

31.6.1
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
Write Protection Registers
To prevent any single software error that may corrupt PIO behavior, certain address spaces can
be write-protected by setting the WPEN bit in the
(PIO_WPMR).
If a write access to the protected registers is detected, then the WPVS flag in the PIO Write Pro-
tect Status Register (PIO_WPSR) is set and the field WPVSRC indicates in which register the
write access has been attempted.
The WPVS flag is reset by writing the PIO Write Protect Mode Register (PIO_WPMR) with the
appropriate access key, WPKEY.
The protected registers are:
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“PIO Controller PIO Enable Register” on page 654
“PIO Controller PIO Disable Register” on page 654
“PIO Controller Output Enable Register” on page 655
“PIO Controller Output Disable Register” on page 656
“PIO Controller Input Filter Enable Register” on page 657
“PIO Controller Input Filter Disable Register” on page 657
“PIO Multi-driver Enable Register” on page 662
“PIO Multi-driver Disable Register” on page 663
“PIO Pull Up Disable Register” on page 664
“PIO Pull Up Enable Register” on page 664
“PIO Peripheral AB Select Register” on page 665
“PIO Output Write Enable Register” on page 668
“PIO Output Write Disable Register” on page 668
“PIO Write Protect Mode Register”
SAM3X/A
SAM3X/A
651
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