Variable Frequency From input button

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codewiz

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button frequency

I want to generate square wave oscillation using PIC16F873A with fixed duty cycle say 50% but i want to be able to change the frequency of oscillation from 1Hz to 1MHz by keying in the required value and make the PIC generate it. 20MHz crystal oscillator is used. pls, i need help on how to do this.
 

The internal PWM module cannot go as high as 1MHZ in small steps.
A software generator can also not be set in small steps.

If you need small steps you could use a DDS chip, connected to the pic.
 

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