SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 1049

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

38.7.31
Name:
Address:
Access:
• WPCMD: Write Protect Command
This command is performed only if the WPKEY value is correct.
0 = Disable the Write Protect SW of the register groups of which the bit WPRGx is at 1.
1 = Enable the Write Protect SW of the register groups of which the bit WPRGx is at 1.
2 = Enable the Write Protect HW of the register groups of which the bit WPRGx is at 1.
3 = No effect.
Note:
• WPRGx: Write Protect Register Group x
0 = The WPCMD command has no effect on the register group x.
1 = The WPCMD command is applied to the register group x.
• WPKEY: Write Protect Key
Should be written at value 0x50574D (“PWM” in ASCII). Writing any other value in this field aborts the write operation of the
WPCMD field. Always reads as 0.
List of register groups:
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
• Register group 0:
• Register group 1:
• Register group 2:
WPRG5
Moreover, to meet security requirements, in this mode of operation, the PIO lines associated with PWM can not be con-
figured through the PIO interface, not even by the PIO controller.
–
–
–
–
–
31
23
15
7
“PWM Clock Register” on page 1018
“PWM Disable Register” on page 1020
“PWM Sync Channels Mode Register” on page 1026
“PWM Channel Mode Register” on page 1056
“PWM Stepper Motor Mode Register” on page 1048
Only a hardware reset of the PWM controller can disable the Write Protect HW.
PWM Write Protect Control Register
PWM_WPCR
0x400940E4
Write-only
WPRG4
30
22
14
6
WPRG3
29
21
13
5
WPRG2
28
20
12
4
WPKEY
WPKEY
WPKEY
WPRG1
27
19
11
3
WPRG0
26
18
10
2
25
17
9
1
WPCMD
SAM3X/A
SAM3X/A
24
16
8
0
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