Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD データシート
製品コード
ATSAM4S-XPLD
298
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
18.5.3 Supply Controller Control Register
Name:
SUPC_CR
Address:
0x400E1410
Access:
Write-only
• VROFF: Voltage Regulator Off
0 (NO_EFFECT) = no effect.
1 (STOP_VREG) = if KEY is correct, asserts vddcore_nreset and stops the voltage regulator.
• 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.
• KEY: Password
Should be written to value 0xA5. Writing any other value in this field aborts the write operation.
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
–
–