Datasheet

383
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
19.5.3 Supply Controller Control Register
Name: SUPC_CR
Address: 0x400E1810
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.
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.
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
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76543210
––––XTALSELVROFF––
Value Name Description
0xA5 PASSWD Writing any other value in this field aborts the write operation.