STM8S003F3 reset pin - output frequency

Discussion in 'Embedded Systems and Microcontrollers' started by Vindhyachal Takniki, Feb 27, 2015.

  1. Vindhyachal Takniki

    Thread Starter Member

    Nov 3, 2014
    349
    6
    1. I have made a circuit using STM8S003F3.
    I don't understand somehow when I probe reset pin of MCU, it is giving 12Khz freq output.
    Thus I am unable to program/debug the MCU.

    2. I have removed everything else from board. Just +5V supply & MCU.
    MCU supply is decoupled by 0.1u & 1u caps.
    Vcap pins is decoupled by 1uF cap.
    Reset pin is decoupled by 0.1uF cap.
    That's it . Nothing else on circuit.

    3. I have probed VCC pin of MCU, I get clean +5V across it.
    Probing Vcap pin gives +2V clean.
    I have also removed 0.1u cap from reset pin & then checked the bare pin but same result.

    Edit: I have also changed 2 MCU but same results
     
  2. Vindhyachal Takniki

    Thread Starter Member

    Nov 3, 2014
    349
    6
    Problem solved. By mistake I had connected 1pf at vcap pin instaed of 1uF.
     
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