[PIC®/AVR®/dsPIC®产品] PIC16F877A单片机（如何写 配置字）

单击production—set Configuration Bit----点击 generate source code to output ----复制生成内容到main函数

// PIC16F877A Configuration Bit Settings

// 'C' source line config statements

// CONFIG

#pragma config FOSC = EXTRC     // Oscillator Selection bits (RC oscillator)

#pragma config WDTE = ON        // Watchdog Timer Enable bit (WDT enabled)

#pragma config PWRTE = OFF      // Power-up Timer Enable bit (PWRT disabled)

#pragma config BOREN = ON       // Brown-out Reset Enable bit (BOR enabled)

#pragma config LVP = ON         // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit (RB3/PGM pin has PGM function; low-voltage programming enabled)

#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)

// #pragma config statements should precede project file includes.

// Use project enums instead of #define for ON and OFF.

#include <xc.h>

第一种方法：

// Config Register: CONFIG 配置字

__CONFIG(FOSC_HS&WDTE_OFF&LVP_OFF);//高斯速晶振，看门狗关闭，低压编程关闭

//__CONFIG(0x3f7A);  // 和上一条语句等价

/*   配置字的解释说明：

// HS oscillator 大于4M晶振

// XT oscillator 400K-4M晶振

// LP oscillator 小于400K晶振

// RC oscillator 阻容震荡，单片机不接晶振，外接电阻和电容来震荡，精度低，受温度影响大

// WDT enabled

#define WDTE_ON              0xFFFF

// WDT disabled

#define WDTE_OFF             0xFFFB

// Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit

// RB3/PGM pin has PGM function; low-voltage programming enabled

#define LVP_ON               0xFFFF

// RB3 is digital I/O, HV on MCLR must be used for programming

#define LVP_OFF              0xFF7F

*/