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When i power on the board with BOOT0 pin to 1 the micro goes in BOOT mode (I think) but an infinite NRST reset loop is triggered every 30 milliseconds with a duration of 20 microseconds. Can you help me? Magnani

HTitalia
Associate II

i am using an STM32L4R9ZGJ6 

4 REPLIES 4
Uwe Bonnes
Principal II

Check option bytes is hardware watchdog is enabled.

HTitalia
Associate II

Thanks for the answer, i checked the OPTR register but the hardware watchdog is disable, all option bit are right

Uwe Bonnes
Principal II

So check you schematic fot logical errors and your board fort shorts and opens.

VCAP pins and capacitors

VDDA

OSCOUT

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