14.7.8 48MHz Internal Oscillator (OSC48M) Control

Name: OSC48MCTRL
Offset: 0x14
Reset: 0x82
Property: PAC Write-Protection

Bit 76543210 
 ONDEMANDRUNSTDBY    ENABLE  
Access R/WR/WR/W 
Reset 101 

Bit 7 – ONDEMAND On Demand Control

The On Demand operation mode allows the oscillator to be enabled or disabled depending on peripheral clock requests.

If the ONDEMAND bit has been previously written to '1', the oscillator will only be running when requested by a peripheral. If there is no peripheral requesting the oscillator’s clock source, the oscillator will be in a disabled state.

If On Demand is disabled the oscillator will always be running when enabled.

In standby sleep mode, the On Demand operation is still active.

ValueDescription
0 The oscillator is always on, if enabled.
1 The oscillator is enabled when a peripheral is requesting the oscillator to be used as a clock source. The oscillator is disabled if no peripheral is requesting the clock source.

Bit 6 – RUNSTDBY Run in Standby

This bit controls how the OSC48M behaves during standby sleep mode.

ValueDescription
0 The OSC48M is disabled in Standby Sleep mode if no peripheral requests the clock.
1 The OSC48M is not stopped in Standby Sleep mode. If ONDEMAND=1, the OSC48M will be running when a peripheral is requesting the clock. If ONDEMAND=0, the clock source will always be running in Standby Sleep mode.

Bit 1 – ENABLE Oscillator Enable

ValueDescription
0 The oscillator is disabled.
1 The oscillator is enabled.