Datasheet

SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
280
16.5.3 Supply Controller Control Register
Name: SUPC_CR
Address: 0x400E1A10
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
–––––– –
76543210
––––XTALSELVROFF––