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
337
SAM4S Series [DATASHEET]
Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14
18.4.3 Supply Controller Control Register
Name:
SUPC_CR
Address:
0x400E1410
Access:
Write-only
This register can only be written if the WPEN bit is cleared in the System Controller Write Protection Mode Register
(SYSC_MR).
VROFF: Voltage Regulator Off
0 (NO_EFFECT): No effect.
1 (STOP_VREG): If KEY is correct, asserts the vddcore_nreset and stops the voltage regulator.
1 (STOP_VREG): If KEY is correct, asserts the vddcore_nreset and stops the voltage regulator.
Note: This bit is located in the VDDIO domain.
XTALSEL: Crystal Oscillator Select
0 (NO_EFFECT): No effect.
1 (CRYSTAL_SEL): If KEY is correct, switches the slow clock on the crystal oscillator output.
1 (CRYSTAL_SEL): If KEY is correct, switches the slow clock on the crystal oscillator output.
Note: This bit is located in the VDDIO domain.
KEY: Password
31
30
29
28
27
26
25
24
KEY
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
9
8
–
–
–
–
–
–
–
–
7
6
5
4
3
2
1
0
–
–
–
–
XTALSEL
VROFF
–
–
Value
Name
Description
0xA5
PASSWD
Writing any other value in this field aborts the write operation.