使用中断作为延时在LED上递增计数

#include <xc.h>

// PIC16F1719 Configuration Bit Settings

// For more on Configuration Bits, consult y**ice data sheet

// CONFIG1

#pragma config FOSC = ECH // External Clock, 4-20 MHz

#pragma config WDTE = OFF // Watchdog Timer (WDT) disabled

#pragma config PWRTE = OFF // Power-up Timer disabled

#pragma config MCLRE = ON // MCLR/VPP pin function is MCLR

#pragma config CP = OFF // Flash Memory Code Protection off

#pragma config BOREN = ON // Brown-out Reset enabled

#pragma config CLKOUTEN = OFF // Clock Out disabled.

#pragma config IESO = ON // Internal/External Switchover on

#pragma config FCMEN = ON // Fail-Safe Clock Monitor enabled

// CONFIG2

#pragma config WRT = OFF // Flash Memory Self-Write Protect off

#pragma config PPS1WAY = ON // PPS one-way control enabled

#pragma config ZCDDIS = ON // Zero-cross detect disabled

#pragma config PLLEN = OFF // Phase Lock Loop disable

#pragma config STVREN = ON // Stack Over/Underflow Reset enabled

#pragma config BORV = LO // Brown-out Reset low trip point

#pragma config LPBOR = OFF // Low-Power Brown Out Reset disabled

#pragma config LVP = OFF // Low-Voltage Programming disabled

// Interrupt function 

void interrupt isr(void){

// only process Timer0-triggered interrupts

if(INTCONbits.TMR0IE && INTCONbits.TMR0IF) {

 // static variable for permanent storage duration

 static unsigned char portValue;

 // write to port latches

 LATD = portValue++; // RD[0:3] = LED[0:3]

 LATB = (portValue++ >> 4); // RB[0:3] = LED[4:7]

 // clear this interrupt condition

 INTCONbits.TMR0IF = 0;

}

}

void main(void){

 // Port D access

 ANSELD = 0x0; // set to digital I/O (not analog)

 TRISD = 0x0; // set all port bits to be output

 // Port B access

 ANSELB = 0x0; // set to digital I/O (not analog)

 TRISB = 0x0; // set all port bits to be output

 // Timer0 setup 

 OPTION_REG = 0xD7; // timer 0 internal clock, prescaler 1:256

 INTCONbits.TMR0IE = 1; // enable interrupts for timer 0

 ei(); // enable all interrupts

 while(1);

return;

}