SAM3SD8B Atmel Corporation, SAM3SD8B Datasheet - Page 516

• Manufacturer Part Number: SAM3SD8B
• Manufacturer: Atmel Corporation

27.5.14
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SAM3S8/SD8
SAM3S8/SD8
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 Enable Register” on page 521
“PIO Disable Register” on page 521
“PIO Output Enable Register” on page 522
“PIO Output Disable Register” on page 523
“PIO Input Filter Enable Register” on page 524
“PIO Input Filter Disable Register” on page 524
“PIO Multi-driver Enable Register” on page 529
“PIO Multi-driver Disable Register” on page 530
“PIO Pull Up Disable Register” on page 531
“PIO Pull Up Enable Register” on page 531
“PIO Peripheral ABCD Select Register 1” on page 533
“PIO Peripheral ABCD Select Register 2” on page 534
“PIO Output Write Enable Register” on page 539
“PIO Output Write Disable Register” on page 539
“PIO Pad Pull Down Disable Register” on page 537
“PIO Pad Pull Down Status Register” on page 538
“PIO Parallel Capture Mode Register” on page 550
“PIO Write Protect Mode Register”
11090A–ATARM–10-Feb-12
11090A–ATARM–10-Feb-12