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LPC4357 watchdog unable to reset the mcu

Question asked by uaz on May 26, 2019
Latest reply on Jun 17, 2019 by ZhangJennie

Hi,

 

I'm having a problem with my watchdog, where it fails to reset the mcu (custom board) after watchdog timer times out. The mcu will stall instead of resetting. I'm running a slightly modified version of LPCopen watchdog example (removed semihosting and let the mcu to watchdog reset after several seconds running).

 

I ran the same watchdog example code on lpcxpresso4367, but the mcu managed to reset successfully. Now I'm suspecting hardware problem but I have no idea where.

 

Is there any particular circuit or setting needed for the watchdog to work correctly?

Or is there defective batch of LPC4357JBD208 chip?

 

Thanks,

UAZ

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