MCLR problem??

[Guest]

Hi all, i am very new to PIC, and have got a small problem. I have got a PICF877A. I am, for now, trying to flash a LED. I have got a 4MHz resinator, and the MCLR pin is high with a 10k and a .1uf cap. I have check for +5 on MCLR and it is OK. When i power on, the LED just stays on. I can make the thing work by touching the OCS1 pin with my bare hand, but when i let go, it will stop. I have also used a 20MHz crystal and a PICF84A without much luck. Here is my code just incase i am doing somthing wrong.


#include <16F877a.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=4000000)

void main() {
while (TRUE) {
output_high(PIN_A0);
delay_us(500);
output_low(PIN_A0);
delay_us(500);
}
}


Thank you very much

Mark Demczuk

[Guest]

The first thing I would do would be to change the delay_us to delay_ms since 500 us is .5 milliseconds - very fast. It would probably appear to be ON all of the time.

[Markdem]

Thank you so much, i cant belive i did that. Set time to 2000 and it works

Mark

[Mark]

@4MHz you should be using XT instead of HS

[Guest]

[rnielsen]

The Guest phantom Quote poster has struck again....

One reason to get rid of Guest posting.