CCS C Software and Maintenance Offers
FAQFAQ   FAQForum Help   FAQOfficial CCS Support   SearchSearch  RegisterRegister 

ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

CCS does not monitor this forum on a regular basis.

Please do not post bug reports on this forum. Send them to support@ccsinfo.com
Internal Oscillator

 
Post new topic   Reply to topic    CCS Forum Index -> General CCS C Discussion
View previous topic :: View next topic  
Author Message
uni_student



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

View user's profile Send private message Send e-mail MSN Messenger

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
Display posts from previous:   
Post new topic   Reply to topic    CCS Forum Index -> General CCS C Discussion All times are GMT - 6 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group