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Clock frequency change

 
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cookster666



Joined: 28 Oct 2003
Posts: 3

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Clock frequency change
PostPosted: Tue Feb 10, 2004 9:01 am     Reply with quote
Hello,

I am currently running a PIC16f877-20/P at 20MHz. I am using the pic to generate a PWM output. The minimium PWM output frequency is too high running at 20MHz so I would like to change this to 4MHz. Can I simply change the clock oscillator and code to change this or do I need to get a PIC16f877-4/P?

AC
Neutone



Joined: 08 Sep 2003
Posts: 839
Location: Houston

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PostPosted: Tue Feb 10, 2004 9:20 am     Reply with quote
The -20 specifies the maximum rated operating frequency.
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Tue Feb 10, 2004 10:09 am     Reply with quote
Which means DC-20Mhz. You should also change your fuse the XT intead of HS.
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