13.3.2.1.1 Power-on Reset (POR)

The purpose of the Power-on Reset (POR) is to ensure a safe start-up of logic and memories. The POR will keep the device in Reset until the voltage level is high enough. The POR is generated by an on-chip detection circuit. The POR is always enabled and activated when VDD is below the POR threshold voltage.

Figure 13-2. MCU Start-Up, RESET Tied to VDD
Figure 13-3. MCU Start-Up, RESET Extended Externally