15.4.2.1 BODVDD Basic Operation

The brown-out detector (BODVDD) monitors the power supply and compares the voltage with two programmable brown-out threshold levels. The brown-out threshold level defines when to generate a Reset. A Voltage Level Monitor (VLM) analyzes the power supply and compares it to a threshold higher than the BODVDD threshold. The VLM can then generate an interrupt request as an early warning when the supply voltage is about to drop below the VLM threshold. The VLM threshold level is expressed as a percentage above the BODVDD threshold level.

The BODVDD is mainly controlled by fuses. The mode used in Standby sleep mode and Power-Down sleep mode can be altered during normal program execution. The VLM part of the BODVDD is also controlled by the I/O registers. When activated, the BODVDD can operate in Continuous mode, where it is continuously active, or in Sampling mode, where it is activated periodically to check the supply voltage level.