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terryhao
Visitor II
May 27, 2003
Question

ISP problem

  • May 27, 2003
  • 2 replies
  • 652 views
Posted on May 27, 2003 at 08:59

ISP problem

    This topic has been closed for replies.

    2 replies

    T
    terryhaoAuthor
    Visitor II
    May 27, 2003
    Posted on May 27, 2003 at 08:10

    Dear Sir,

    I use ST7MDT2-DVP2 to program St72C334N4T6 by using ISP. First I can program the programm area(I forgot to program the option byte) and then the program can work. But now I can not program with ISP.

    I don't know why? I measure the Reset pin and ISPSEL pin and found that the Reset Pin is OK and I can see 33 clock on ISPSEL pin but the bottom level of ISPSEL is about -1V. the voltage of ISPCLK and ISPDATA pin is always 0V. could anyone help me? Thanks a lot!
    S
    sjo
    Visitor II
    May 27, 2003
    Posted on May 27, 2003 at 08:59

    It sounds like you have corruputed the option bytes, try applying an external clock to the OSC1 pin, this may help you recover.

    Regards

    Spen
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