SAM4L Datasheet, PDF (225/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
• PLLEN: PLL Enable
0: PLL is disabled.
1: PLL is enabled.
Note that it is not possible to change any of the PLL configuration bits when the PLL is enabled, Any write to PLLn while the PLL
is enabled will be discarded.
Note that this register is protected by a lock. To write to this register the UNLOCK register has to be written first. Refer to
Section 13.7.7 ”Unlock Register” on page 222 for details.
42023C–SAM–02/2013
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