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RC7 on PIC16F876(A)

 
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iw2nzm
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RC7 on PIC16F876(A)
PostPosted: Sat Dec 30, 2006 4:36 pm     Reply with quote
Hi to all,

I can't use the RC7 pin as output. I know it's multiplexed with serial RX but when the SPEN is 0 it should work as output.

Here is the code:

Code:

#include <16f876a.h>
#fuses HS, NOWDT, PUT,NOPROTECT,BROWNOUT,NOLVP,NOCPD,NOWRT,NODEBUG
#use delay(clock = 16000000, RESTART_WDT)
#use fast_io(c)
#byte  rcsta = 0x18

void main() {
set_tris_c(0x00);
rcsta = 0x00;

output_high(PIN_C7);
for (;;) {}


There is no hardware connected to the PIC. Other pins works fine and the oscillator runs.

May anyone help me?

Marco / iw2nzm
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Dec 31, 2006 1:47 am     Reply with quote
Normally the Rx pin on the PIC is connected to the output of a
MAX232-type chip. The output of the MAX232's receive section
may conflict with the using pin C7 as an output.
What external circuit or chip is connected to pin C7 ?

Also, did you post your complete test program ? It's missing the
closing brace of main(). Is there more ? Is there a #use rs232()
statement in your program ?

What is your compiler version ?
Guest
PostPosted: Sun Dec 31, 2006 2:33 am     Reply with quote
PCM programmer wrote:
Normally the Rx pin on the PIC is connected to the output of a
MAX232-type chip. The output of the MAX232's receive section
may conflict with the using pin C7 as an output.
What external circuit or chip is connected to pin C7 ?

Also, did you post your complete test program ? It's missing the
closing brace of main(). Is there more ? Is there a #use rs232()
statement in your program ?

What is your compiler version ?


Hi,

I forgot the closing brace when I did copy&paste. There are no other code and on the board there are only the PIC, the oscillator section (16 MHz crystal and two 22pF capacitor) and a 100 nF bypass capacitor on power supply.

I don't need any serial communication, just digital output on Port C.
My compiler version is: 3.6.0.99

I wish you a happy new year Smile

Marco / iw2nzm
iw2nzm
Guest
PostPosted: Sun Dec 31, 2006 2:49 am     Reply with quote
I solved! There was a short on the board Evil or Very Mad

I'm sorry for the useless thread Embarassed

However, thanks for the support

Marco / iw2nzm
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