STM32 Reset pin duration

[abhijith_raj]

Hi,
We are working with the STM32G491 board and intend to drive the NRST pin using an external device. Could you please confirm the minimum low-level pulse duration on the NRST pin for it to be recognized as a valid reset by the MCU?

[TDK · Accepted solution]

350 ns

[abhijith_raj]

Hi @TDK ,
The external device controls both the BOOT and NRST pins of the STM32G491 MCU. According to the datasheet, the minimum low-level pulse duration on the NRST pin required to trigger a reset is 350 ns. If I hold the BOOT pin high and apply a 1 ms low pulse on the NRST pin, will the MCU recognize it as a valid reset and enter bootloader mode?

[TDK]

Yes, provided the BOOT0 pin state is not disabled in option bytes. See AN2606.