Problem in using AT89C52

Hi there,

i have problem in using AT89C52. When i used this ic, my board is not working at retrieving data and sending data to pc. Previously i have done using 8051 in demoboard and it works fine.

For this AT89C52 i have included the library file <AT89x52> but still my board is not working , why? . i have enabled the "use on chip rom" and have connected the EA pin to logic high. but i do observe that there is no oscillation signal at pin 18. Is there any setting that i have to set for this AT89C52??

Please help me on this problem. Your help is much appreciated.

Thanks.
Nore

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  • there is no oscillation signal at pin 18
    since you do not specify the package "pin 18" is meaningless, but if is XTAL1 or XTAL2 there is only the following possibilities:
    1)bad connection crystal or 33pf caps
    2) Vcc or Gnd missig to the chip
    3) bum chip

    There is NO way you can kill the oscillator in a working circuit.

    Erik

Reply
  • there is no oscillation signal at pin 18
    since you do not specify the package "pin 18" is meaningless, but if is XTAL1 or XTAL2 there is only the following possibilities:
    1)bad connection crystal or 33pf caps
    2) Vcc or Gnd missig to the chip
    3) bum chip

    There is NO way you can kill the oscillator in a working circuit.

    Erik

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