Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet
Product codes
ATSAM4S-WPIR-RD
SAM4S Series [DATASHEET]
Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14
986
39.7.30 PWM Write Protection Control Register
Name:
PWM_WPCR
Address:
0x400200E4
Access:
Write-only
• WPCMD: Write Protect Command
This command is performed only if the WPKEY value is correct (0x50574D, “PWM” in ASCCII).
• 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.
1: The WPCMD command is applied to the register group x.
• WPKEY: Write Protect Key
List of register groups:
• Register group 0:
• Register group 1:
• Register group 2:
• Register group 3:
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
7
6
5
4
3
2
1
0
WPRG5
WPRG4
WPRG3
WPRG2
WPRG1
WPRG0
WPCMD
Value
Name
Description
0
DISABLE_SW_PROT
Disable the Software Write Protect of the register groups of which the bit WPRGx is at ‘1’.
1
ENABLE_SW_PROT
Enable the Software Write Protect of the register groups of which the bit WPRGx is at ‘1’.
2
ENABLE_HW_PROT
Enable the Hardware Write Protect of the register groups of which the bit WPRGx is at ‘1’. Only a
hardware reset of the PWM controller can disable the hardware write protect. Moreover, to meet
security requirements, the PIO lines associated with PWM can not be configured through the PIO
interface.
Value
Name
Description
0x50574D
PASSWD
Writing any other value in this field aborts the write operation of the WPCMD field.
Always reads as 0
Always reads as 0