13.6.10 32.768 kHz Internal Oscillator (OSC32K) Control

This bit controls whether the OSC32K Control register (OSC32KCTRL) is locked for future writes. When the Write Lock bit (OSC32KCTRL.WRTLOCK) is ‘1’, the configuration for the OSC32K oscillator is locked and can only be unlocked by a Device Reset.

Writes to this register, when Local Write-Protection is enabled, will be discarded and return a bus error.

A write access from a debugger will disregard the status of WRTLOCK. Even if the OSC32KCTRL.WRTLOCK bit is ‘1’, this will not prevent a debugger write to the OSC32KCTRL register.

A Device Reset reset will clear this bit to the unlocked state.

Writing a ‘0’ to this bit will cause the OSC32K oscillator to always run when the Oscillator Enable bit (OSC32KCTRL.ENABLE) is ‘1’.

Writing a ‘1’ to this bit will cause the OSC32K oscillator run only if the OSC32KCTRL.ENABLE bit is ‘1’ and it is requested by a peripheral. If no peripherals are requesting the OSC32K clock source, the OSC32K oscillator will be in a disabled state.

Refer to the Sleep Mode Operation section for additional information.