Pins during reset

sjackson · ‎2007-11-20

Posted on November 20, 2007 at 12:07

Pins during reset

sjackson · ‎2011-05-17

Posted on May 17, 2011 at 09:47

Can anyone tell me what the state of the pins on the STR9 are during reset? I'm trying to do some various checks when my system starts up, during which time the STR9's reset line is held low (so that the MCU itself is held in reset), but it seems that at least one of these checks is broken by the fact that the STR9 is in a reset state. All my tests work fine when the reset line is high and the chip is active.

I'm not sure if it is the processor or something else but I know that some other processors dedicate certain pins to ISP when the reset line is low. I'm particularly interested in port 4.

Thanks!

vsilvaamorim · ‎2011-05-17

Posted on May 17, 2011 at 09:47

Hi

The GPIO pins are input by default.

For more details see page 88 of STR912_RM_12126.pdf.

Regards

Vitor Amorim