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Internal Oscillator

 
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uni_student



Joined: 01 Aug 2007
Posts: 38
Location: AUckland, NEW ZEALAND

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Internal Oscillator
PostPosted: Thu May 28, 2009 1:33 am     Reply with quote
Hi, using PIC16F716 just to turn LED on, when high input on any b port pins, and then send a specific character onto UART. Tried with uart program and LED not even blinking, or LED stays on continuously. Commented UART stuff out and LED does the same thing.

I am using the internal oscillator so am wondering if I'm doing anything wrong in the code for that feature. Have checked circuit over many times and all is good.

Any help appreciated!!!
Code:

#include <16f716.h>
#fuses HS,NOWDT,NOPROTECT
#include <string.h>

#use delay(clock=4000000)
//#use rs232(baud=9600, xmit=PIN_B3, parity=N, bits=8, INVERT, ERRORS)

#define LED PIN_A1
#define data PIN_B3

void main(){

   output_high (LED);
   //port_b_pullups(TRUE);
   output_low(data);
   delay_ms(1000);
   output_low (LED);

   while (TRUE){
      if(input (PIN_B0)){
            //putc('a');
            output_high(LED);
            delay_ms(500);     //switch debounce
            output_low(LED);
      }
      if (input (PIN_B1)){
           // putc('b');
            output_high(LED);
            delay_ms(500);  //switch debounce
            output_low(LED);
      }
      if(input (PIN_B2)){
           // putc('c');
            output_high(LED);
            delay_ms(500);     //switch debounce
            output_low(LED);
      }
      if (input (PIN_B4)){
           // putc('1');
            output_high(LED);
            delay_ms(500);  //switch debounce
            output_low(LED);
      }
      if (input (PIN_B5)){
           // putc('2');
            output_high(LED);
            delay_ms(500);  //switch debounce
            output_low(LED);
      }
      if(input (PIN_B6)){
           // putc('3');
            output_high(LED);
            delay_ms(500);     //switch debounce
            output_low(LED);
      }
      if (input (PIN_B7)){
          //  putc('?');
            output_high(LED);
            delay_ms(500);  //switch debounce
            output_low(LED);
      }
   }
}
Ttelmah
Guest
PostPosted: Thu May 28, 2009 2:28 am     Reply with quote
You are not using an internal oscillator....

'HS' fuse, means use external high speed crystal.

The 16F716, _does not have an internal oscillator_......

You need to switch to a chip that has an internal oscillator block, or add an external crystal. For a 4Mhz crystal, the fuse would be 'XT'.

Best Wishes
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