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Frequency Counter 2Mhz using 8254 and 89C55wd

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provision

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Can anyone help me out on this, i need to design a frequency counter for the range 1Hz to 2Mhz using 82C54 and 89C55wd. I have designed a circuit but it gives an error of 1Hz @ 1000-3000, which keeps on increasing as the measurement frequency is increased. Currently i have mazimum range of 132Khz and the circuit is designed on a breadboard.

Is the error because of the stray capacitances of the breadboard ?

Can anyone post the circuit schematics as well as the program code. Preferably for 89C55.


Regards,
Provision
 

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