NRST Hardware Question

luk · ‎2017-01-19

Posted on January 19, 2017 at 12:55

Hey,

I searched for this in the hardware development sheet but there was no real answer to my question. I do not want to use a

switch at the NRST input, because i think everything what the switch does can be made with cutting the power. Is this correct? How should i connect the open NRST? With Pullup resistor to VDD or Capacitance to GND or both?

My Device is a STM32F405.

Thanks in advance for your help.

mark

waclawek.jan · ‎2017-01-19

Posted on January 19, 2017 at 13:06

I don't know which is your device, but there is a recommended NRST connection diagram probably in every STM32's datasheet.

JW

Uwe Bonnes · ‎2017-01-19

Posted on January 19, 2017 at 13:09

If you disconnect power, the RTC will reset. If you only reset, RTC will keep running. There are other registers not affected by reset, e.g. reset cause. So POR and reset are not the same.