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ISP feature of 89C51RD2 with DS1232

Hi All

H/W system has:
1) 89C51RD2 (MC)
2) DS1232 as system reset IC ( Resets sys,if its strobe pin in not toggled in 1.2 Sec).

In normal execution mode 1 port pin of MC toggles strobe pin of DS1232 before 1.2 Sec expires.

ISP feature of 89C51RD2 is to be used for loading hex file in its flash.
Since strobe pin is not toggled in ISP mode,DS1232 keeps on resetting system.
and hence ISP is not able to load hex file.

Sorry to say that this problem is not related to keil.
can anybody provide way out of this if any one who have faced this problem.

rgds
Naresh

Parents
  • Erik

    Mark is correct,
    there are other reasons above that also:

    1)internal watch dog timer in RD2 is
    providing less time delay hence has to be
    refreshed frequently.system is performing
    process which takes on average 1 sec to
    execute and during this period i do not
    want watch dog to be refreshed/reset my
    system.
    2)Board has additional chips(other than
    MC):some require --> /rst and others -->
    rst.
    so best was to use external watchdog/reset
    IC,which will make system reset
    efficient.
    --------------------------------------------
    regarding reset IC & ISP,best is to use seperate RC reset ckt for MC while it is in ISP mode.

    Rgds
    Naresh

Reply
  • Erik

    Mark is correct,
    there are other reasons above that also:

    1)internal watch dog timer in RD2 is
    providing less time delay hence has to be
    refreshed frequently.system is performing
    process which takes on average 1 sec to
    execute and during this period i do not
    want watch dog to be refreshed/reset my
    system.
    2)Board has additional chips(other than
    MC):some require --> /rst and others -->
    rst.
    so best was to use external watchdog/reset
    IC,which will make system reset
    efficient.
    --------------------------------------------
    regarding reset IC & ISP,best is to use seperate RC reset ckt for MC while it is in ISP mode.

    Rgds
    Naresh

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