STM32L151: distinguish BOR and POR/PDR after reset

michaelhagmann9 · ‎2014-07-30

Posted on July 30, 2014 at 10:23

Hello

Is it possible to differ a reset caused by a POR/PDR from one caused by a BOR?

The flag PORRSTF gets set by a PDR as well as by a BOR.

I need to check if power voltage dropped only below VBOR or also below VPOR. Is there a possibility to get that info?

Thanks for helping!

Gizmo

chen · ‎2014-07-30

Posted on July 30, 2014 at 12:29

Hi

I do not have the reference manual for your device but for the STM32F405 you check the

RCC->CSR

It is in the Reset and clock control

michaelhagmann9 · ‎2014-07-30

Posted on July 30, 2014 at 13:17

Thank you for answering.

That's true, the STM32F4 has a PORRSTF and a BORRSTF.

The STM32L1 has only a PORRSTF, so there is no difference between a brown out and a power down reset in this flag.

Is there another chance to find out what caused the reset?

Thank you anyway.

Gizmo