AnsweredAssumed Answered

KEAZN16 NMI problem at startup

Question asked by Blaž Kvas on Apr 10, 2017
Latest reply on Jan 7, 2019 by Kerry Zhou

Hi!

As said in the title I have a problem with the !NMI pin at startup. It is used for SPI_MISO communication.

It's causing problems when I turn on the power supply. The IC that it's communicating with apparently holds down the pin and the NMI gets asserted at startup which causes the uC to lockup (reset won't help). 

I tried with a pullup resistor but it seems to deassert it to late.

 

Does anybody know a way around this problem? Can I disable the NMI pin permanently (I couldn't find anything in the datasheet) ?

Outcomes