SPRACU5C June 2021 – September 2023 AM2431 , AM2432 , AM2434 , AM6411 , AM6412 , AM6421 , AM6422 , AM6441 , AM6442
MCU_PORz is the MCU Domain cold reset external input to the processor. It is recommended to keep the MCU_PORz pulled low during the supply ramp and oscillator start-up. Follow the recommended MCU_PORz reset timing requirement in the Power-Up Sequencing diagram of the device-specific data sheet.
For MCU_PORz (fail-safe), a 3.3 V input can be applied, but the input thresholds are still a function of the 1.8 V IO supply voltage (VDDS_OSC).
Terminate external warm reset inputs MCU_RESETz and RESET_REQz as per the Pin Connectivity Requirements section of the device-specific data sheet. Warm reset inputs (LVCMOS type IOs) have input slew rate requirements. Connecting a capacitor directly at the input is not recommended due to the slow input ramp. A schmitt trigger based debouncing logic is recommended. Refer device-specific EVM schematics for implementing the debouncing logic.