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FREQUENCY MEASUREMENTS

 
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vijayan



Joined: 15 Nov 2005
Posts: 3

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FREQUENCY MEASUREMENTS
PostPosted: Sun Mar 26, 2006 11:37 pm     Reply with quote
DEAR FRIENDS
I MEASURED THE FREQUENCY OF AN ASTABLE MUTIVIBRATOR USING PIC 16F877 WITH THE EXAMPLE CODE FREQ.C IN CCS C COMPILER IT SHOWS A FEQUENCY OF 3800 HZ. BUT THE FEQUENCY COUNTER SHOWS 1482 HZ. THERE IS LARGE DEVIATION. WHAT IS THE REASON? WHAT IS THE ACURACY OF THE MEASUREMENT OF THE PROGRAM? PLEASE HELP ME.
C.VIJAYAN
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Mon Mar 27, 2006 3:11 am     Reply with quote
A subject and/or message in all capital letters is considered shouting, which is rude in most social situations.

What frequency is your hardware running at? The example ex_freq.c is supposed to be running at 20MHz.
vijayan



Joined: 15 Nov 2005
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Frequency measurments
PostPosted: Fri Mar 31, 2006 3:13 am     Reply with quote
Dear Mr ckielstra i am using a hardware running at 20MHz.
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