22.6.5 Synchronization

The prescaler counters that are used to trigger brown-out detections operate asynchronously from the peripheral bus. As a consequence, the BODVDD Enable bit (BODVDD.ENABLE) need synchronization when written.

The Write-Synchronization of the Enable bit is triggered by writing a '1' to the Enable bit of the BODVDD Control register. The Synchronization Ready bit (STATUS.BVDDSRDY) in the STATUS register will be cleared when the Write-Synchronization starts, and set again when the Write-Synchronization is complete. Writing to the same register while the Write-Synchronization is ongoing (STATUS.BVDDSRDY is '0') will generate a PAC error without stalling the APB bus.