PIC32MZ Oscillator - Backup Fast RC Oscillator

Backup Fast RC (BFRC) Oscillator

The PIC32MZ oscillator system includes a Fail-Safe Clock Monitor (FSCM). The FSCM monitors the SYSCLK for continuous operation. If it detects that the SYSCLK has failed, it switches the SYSCLK over to the BFRC oscillator and triggers a Non-Maskable Interrupt (NMI). The BFRC is an untuned 8 MHz oscillator that will drive the SYSCLK during an FSCM event. When code at the NMI vector is executed, the software can attempt to restart the main oscillator or shut down the system.

You cannot choose to use the BFRC for SYSCLK. Only the hardware will use this when FSCM detects a problem.

© 2024 Microchip Technology, Inc.
Notice: ARM and Cortex are the registered trademarks of ARM Limited in the EU and other countries.
Information contained on this site regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.