9.3.6 Brown-out Reset (BOR)

The BOR module generates a device Reset when a brown-out condition occurs to protect against code misexecution. The BOR module is based on an internal voltage reference circuit that monitors V_DD. Brown-out conditions are generally caused by glitches on the AC mains (for example, missing portions of the AC cycle waveform due to bad power transmission lines or voltage sags due to excessive current draw when a large inductive load is turned on).

A BOR generates a Reset pulse which resets the device. The BOR status bit (RCON[1]) is set to indicate that a BOR has occurred. The BOR circuit continues to operate while in Sleep or Idle mode and resets the device should V_DD fall below the BOR threshold voltage. The BOR threshold voltage is detailed in the Electrical Characteristics section.