使用_delay()函数使LED闪烁

#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

void main(void) {

unsigned char portValue;

 // 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

 while(1) { 

 portValue = 0x05;

 LATD = portValue; // write to port latch - RD[0:3] = LED[0:3]

 LATB = portValue; // write to port latch - RB[0:3] = LED[4:7]

 // delay value change 

 _delay(25000); // delay in instruction cycles

 portValue = 0x0A;

 LATD = portValue; // write to port latch - RD[0:3] = LED[0:3]]

 LATB = portValue; // write to port latch - RB[0:3] = LED[4:7]

 _delay(25000); // delay in instruction cycles

 }

 return;

}