8.1 BOD Sleep Mode Operation

The BOD can be configured in four ways for Active operation: Disabled, Enabled, Sampled and Enabled with wake-up halted until BOD is ready.

• Disabled: The BOD is disabled.
• Enabled: The BOD is continually sampling the supply voltage and comparing it to the selected threshold.
• Sampled: The supply voltage is sampled and compared to the threshold at either 125 Hz or 1 kHz.
• Enabled with wake-up halted until BOD is ready: The BOD will sample the supply voltage when a wake-up occurs, and wake-up will be halted until the BOD signals that the supply voltage is above the selected threshold. This adds to the wake-up time. In active mode, the BOD is continually sampling the supply voltage and comparing it to the selected threshold.

For Sleep operation, there are three configurations: Disabled, Enabled, and Sampled.

The Active operation can only be configured using fuses, while the Sleep operation can be configured using both fuses and registers. Refer to the corresponding data sheet for details.