What are the non maskable interrupt I/Os are in STM32L431VCT6?

[Murugavel Swaminathan]

Posted on February 15, 2018 at 07:30

What are the non maskable interrupt I/Os are in STM32L431VCT6?. We plan to use External watchdog for our critical application.Output of WDT going to connected with NMI of STM32l431vct6.

[Tesla DeLorean]

Posted on February 15, 2018 at 14:15

The Reference Manual doesn't suggest such functionality

http://www.st.com/content/ccc/resource/technical/document/reference_manual/group0/b0/ac/3e/8f/6d/21/47/af/DM00151940/files/DM00151940.pdf/jcr:content/translations/en.DM00151940.pdf

 

The internal watch dog does a Reset, that is 'non-maskable', use the NRESET pin to achieve the same.

[Murugavel Swaminathan]

Posted on February 16, 2018 at 07:38

Hi,

   In case i use external watchdog timer, it has separate output for Watchdog reset and nReset. Where i have connect WDT output to controller's I/O?

[Tesla DeLorean]

Posted on February 16, 2018 at 08:09

You'll have to pick a GPIO and configure in EXTI functionality, but it will be maskable.

EXTI0 would have highest priority, pick one of PA0, PB0, PC0, etc.

[Murugavel Swaminathan]

Posted on February 20, 2018 at 07:13

Hi ,

     I plan to use ESD diode on UART I/Os.My controller will run by 3.3v Source.If i choose ESD diode corresponding to my voltage levels, Clamping voltage is around 18v (8/20us). Will I/O support this volatge clamp for small duration?

[Murugavel Swaminathan]

Posted on February 21, 2018 at 05:02

Hi ,

     I plan to use ESD diode on UART I/Os.My controller will run by 3.3v Source.If i choose ESD diode corresponding to my voltage levels, Clamping voltage is around 18v (8/20us). Will I/O support this volatge clamp for small duration?

[Tesla DeLorean]

Posted on February 21, 2018 at 05:07

Still don't know, absolute maximums don't have a duration parameter. I do not work for ST