// PIC16F877A Configuration Bit Settings
// 'C' source line config statements
#include <xc.h>
// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.
// CONFIG
#pragma config FOSC = HS // Oscillator Selection bits (HS oscillator)
#pragma config WDTE = OFF // Watchdog Timer Enable bit (WDT disabled)
#pragma config PWRTE = OFF // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOREN = OFF // Brown-out Reset Enable bit (BOR disabled)
#pragma config LVP = OFF // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit (RB3 is digital I/O, HV on MCLR must be used for programming)
#pragma config CPD = OFF // Data EEPROM Memory Code Protection bit (Data EEPROM code protection off)
#pragma config WRT = OFF // Flash Program Memory Write Enable bits (Write protection off; all program memory may be written to by EECON control)
#pragma config CP = OFF // Flash Program Memory Code Protection bit (Code protection off)
#include <stdio.h>
#include <stdlib.h>
#define _XTAL_FREQ 20000000 //Specify the XTAL crystal FREQ
/*
*
*/
void main(void)
{
PORTD = 0b00000000;
TRISC0 = 1; //PORTC R0 pins are used as Input encoder
TRISD4 = 0; //PORTD R4 pins are used as output.LED
TRISB1 = 1; //PORTC R0 pins are used as Input. sensor
//Loading starting value of counter 65486
TMR1H = 0xFF ; // High byte FF
TMR1L = 0xF6 ; // Low Byte F6
//Set T1CON Register
TMR1ON = 0; // Stops Timer1
TMR1CS = 0; // Oscillator is enabled
T1SYNC = 0; // Synchronize external clock input
T1OSCEN = 0; // Oscillator is shut-off
T1CKPS0 = 0; // 1:8 prescale value
T1CKPS1 = 0;
TMR1IF = 0 ; // Clear interrupt flag
TMR1ON = 1; //Start Timer1
while(1)
{
if(TMR1IF ==1)
{
RD4 = 1; // LED ON
__delay_ms(500); //
RD4 = 0; // LED OFF
__delay_ms(500); //
TMR1IF=0; // Clear timer interrupt flag
//TMR1ON = 0; //Stop Timer1
//reload counter
TMR1H = 0xFF ; // High byte FF
TMR1L = 0xF6 ; // Low Byte F6
}
}
}