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wrong state of pic16f876

 
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microccd



Joined: 08 Aug 2006
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wrong state of pic16f876
PostPosted: Tue Sep 26, 2006 3:40 pm     Reply with quote
I program and test the pic16f876, most of time, it works fine. but sometime when I turn on the power switch, it was in wrong state(wrong output). I shut it down then turn it on again, it will have the correct output. what may cause that? thanks a lot!
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Tue Sep 26, 2006 3:54 pm     Reply with quote
Quote:
But sometime when I turn on the power switch, it was in wrong state(wrong output)

Make sure you have the correct #fuses settings. Make sure you
have the ones shown in bold below:

#include <16F877.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
//====================================
void main()
{

while(1);
}
microccd



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PostPosted: Tue Sep 26, 2006 4:03 pm     Reply with quote
the following is what i'm using, are they correct?


Code:


#include <16f876.h>
#device ICD=TRUE
#fuses HS,NOWDT,NOLVP,PUT
#use delay(clock=20000000)
PCM programmer



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PostPosted: Tue Sep 26, 2006 4:13 pm     Reply with quote
Did you read my post ? Look at the item shown in bold below.
Put it in your code !

#include <16F877.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
microccd



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PostPosted: Tue Sep 26, 2006 4:23 pm     Reply with quote
yes, but what's the function of BROWNOUT? thank you.
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Tue Sep 26, 2006 4:42 pm     Reply with quote
Download the Microchip reference manual on the PIC reset module:
http://ww1.microchip.com/downloads/en/DeviceDoc/31003a.pdf
Read about Brownout on page 8.
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