You have not mentioned the hardware that you are using to generate and
measure pulse.  If the hardware you are using is FP-CTR-500/502, I
have a suggestion.  The terminal count value that is being used has a
direct effect on the value of the frequency generated.  If the value
is set in the range 30 to 4 you can generate a frequency in range
500Hz to 3KHz.  You can vary the terminal count value and try for your
program.

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