12.4.5 BFRC Oscillator

The dsPIC33A devices contain one instance of the Internal Backup Fast RC (BFRC) Oscillator and can function as system clock in the event of a FRC failure. The BFRC Oscillator provides a nominal 8 MHz clock without requiring an external crystal or ceramic resonator, which results in system cost savings for applications that do not require a precise clock reference.

The application software can tune the frequency of the oscillator using the TUN[5:0] bits in the FRC Oscillator Tuning register BFRCTUN.