Additional Enhancements to the Oscillator

The Oscillator Module has additional features that enhance the operation. These include:

• 4x PLL
• Clock Switch
• Two-Speed Start-up
• FSCM - Fail-Safe Clock Monitor
• OST - Oscillator Start-up Timer

PLL uses a Phase Locked Loop to boost the oscillator speed by 4x. PLL is enabled by the PLLEN bit in a configuration word.

Clock Switching allows software to change the clock source between internal and external sources.

Two -Speed Start-up can eliminate the external oscillator start-up time and also reduce the overall power consumption of the device. This is very handy in applications that use the sleep function. The application can perform a few instructions using the internal oscillator and then return to sleep without having to wait for the external oscillator to become stable.

Fail-Safe Clock Monitor allows the device to keep operating if the external oscillator should fail.

Oscillator Start-up Timer ensures the external crystal is stable when instructions begin executing.