Datasheet

374
11011B–ATARM–21-Feb-12
SAM3N
24.15.19 PMC Write Protect Mode Register
Name: PMC_WPMR
Address: 0x400E04E4
Access: Read-write
Reset: See Table 24-2
• WPEN: Write Protect Enable
0 = Disables the Write Protect if WPKEY corresponds to 0x504D43 (“PMC” in ASCII).
1 = Enables the Write Protect if WPKEY corresponds to 0x504D43 (“PMC” in ASCII).
Protects the registers:
• “PMC System Clock Enable Register” on page 355
• “PMC System Clock Disable Register” on page 355
• “PMC Peripheral Clock Enable Register” on page 357
• “PMC Peripheral Clock Disable Register” on page 358
• “PMC Clock Generator Main Oscillator Register” on page 360
• “PMC Clock Generator PLL Register” on page 363
• “PMC Master Clock Register” on page 364
• “PMC Programmable Clock Register” on page 365
• “PMC Fast Startup Mode Register” on page 371
• “PMC Fast Startup Polarity Register” on page 372
• “PMC Oscillator Calibration Register” on page 376
• WPKEY: Write Protect KEY
Should be written at value 0x504D43 (“PMC” in ASCII). Writing any other value in this field aborts the write operation of the
WPEN bit. Always reads as 0.
31 30 29 28 27 26 25 24
WPKEY
23 22 21 20 19 18 17 16
WPKEY
15 14 13 12 11 10 9 8
WPKEY
76543210
–––––––WPEN