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Variable Frequency From input button
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codewiz



Joined: 14 Sep 2008
Posts: 75
Post13 Jul 2009 7:48   

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.
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smd_lover



Joined: 19 Jul 2009
Posts: 28
Location: Netherlands
Post19 Jul 2009 12:47   

Re: Variable Frequency From input button
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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