FAQs
cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 

problem on watchdog

fabricepeden
Associate II

‎2013-08-05 05:51 AM

Posted on August 05, 2013 at 14:51

Hi everbody,

I'm using a ST32F205VE. On my board, I'm using the internal watchdog of the microcontroller and an external watchdog (MCP1318T).

During normal operation, the �c sends square pulses every 0.5s to the external watchdog. When the �c stops sending pulses, the external watchdog sends me a rising edge.

Then, the �c is restarting because So it works well.

My issue is when the �c is restarting (with his internal watchdog), I got something strange, because the pulses that the �c is sending to the external watchdog are 3 times longer (0.5s to 1.5s) and I've changed nothing in my configuration.

I'm looking for explanations in the datasheet, but I've found nothing...

If you've some ideas...thank you in advance.

#rcc
Labels:
0 Kudos
1 REPLY 1
jpeacock2399
Associate II

‎2013-08-05 06:44 AM

Posted on August 05, 2013 at 15:44

How do you generate the reset pulse to the external watchdog?  Keep in mind that after a reset the STM32 runs on the HSI internal oscillator clock until you change to HSE and/or set the PLL multiplier.

  Jack Peacock
0 Kudos
Top