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karlengelbert
Visitor II
July 9, 2013
Question

Brand-new STM8S207K6 pulls reset low

  • July 9, 2013
  • 1 reply
  • 533 views
Posted on July 09, 2013 at 09:22

Hello,

I'm trying to get a first program on a bunch of new STM8S207K6 but the device does not answer. It seems like the reset pin is pulled low by the controller and the programming tool keeps telling me ''Error: Cannot connect to the device !''.

I tried with three controllers and with a minimum configuration with capacitors on NRST, VCAP and VDD but with no luck, all behave the same. I am able to flash another board with a STM8S003K3, so software and programmer seems to be OK. Also the 003 keeps reset high at startup.

All help is highly appreciated!

Thank you in advance.

Best

Karl E.

#stm8s207k6-reset-low-stm8s-207
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    1 reply

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    p2
    Visitor II
    September 3, 2013
    Posted on September 03, 2013 at 11:37

    Hi,

    I have the same problem with a STM8S005. The reset pin is pulled down by the microcontroller itself every ~1.1 sec, and for a very short time. This short time, however, is still long enough to trigger the reset IC we are using. Then, the reset IC pulls the line down for a longer time. Because of this, our prototype cannot be programmed using SWIM interface.

    What is the reason why STM8 is pulling his reset pin low from time to time? Can we prevent this by any mean?

    (We are using STM8S005K6, and try to program it using the ''STM8S-discovery

    '' programmer. )

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