// PIC18F25K80 Configuration Bit Settings
// CONFIG1L
#pragma config RETEN = OFF // VREG Sleep Enable bit (Ultra low-power regulator is Disabled (Controlled by REGSLP bit))
#pragma config INTOSCSEL = HIGH // LF-INTOSC Low-power Enable bit (LF-INTOSC in High-power mode during Sleep)
#pragma config SOSCSEL = DIG // SOSC Power Selection and mode Configuration bits (Digital (SCLKI) mode)
#pragma config XINST = OFF // Extended Instruction Set (Disabled)
// CONFIG1H
#pragma config FOSC = HS1 // Oscillator (HS oscillator (Medium power, 4 MHz - 16 MHz))
#pragma config PLLCFG = OFF // PLL x4 Enable bit (Disabled)
#pragma config FCMEN = OFF // Fail-Safe Clock Monitor (Disabled)
#pragma config IESO = OFF // Internal External Oscillator Switch Over Mode (Disabled)
// CONFIG2L
#pragma config PWRTEN = OFF // Power Up Timer (Disabled)
#pragma config BOREN = OFF // Brown Out Detect (Disabled in hardware, SBOREN disabled)
#pragma config BORV = 3 // Brown-out Reset Voltage bits (1.8V)
#pragma config BORPWR = HIGH // BORMV Power level (BORMV set to high power level)
// CONFIG2H
#pragma config WDTEN = OFF // Watchdog Timer (WDT disabled in hardware; SWDTEN bit disabled)
#pragma config WDTPS = 1048576 // Watchdog Postscaler (1:1048576)
// CONFIG3H
#pragma config CANMX = PORTB // ECAN Mux bit (ECAN TX and RX pins are located on RB2 and RB3, respectively)
#pragma config MSSPMSK = MSK7 // MSSP address masking (7 Bit address masking mode)
#pragma config MCLRE = ON // Master Clear Enable (MCLR Enabled, RE3 Disabled)
// CONFIG4L
#pragma config STVREN = ON // Stack Overflow Reset (Enabled)
#pragma config BBSIZ = BB1K // Boot Block Size (1K word Boot Block size)
// CONFIG5L
#pragma config CP0 = OFF // Code Protect 00800-01FFF (Disabled)
#pragma config CP1 = OFF // Code Protect 02000-03FFF (Disabled)
#pragma config CP2 = OFF // Code Protect 04000-05FFF (Disabled)
#pragma config CP3 = OFF // Code Protect 06000-07FFF (Disabled)
// CONFIG5H
#pragma config CPB = OFF // Code Protect Boot (Disabled)
#pragma config CPD = OFF // Data EE Read Protect (Disabled)
// CONFIG6L
#pragma config WRT0 = OFF // Table Write Protect 00800-01FFF (Disabled)
#pragma config WRT1 = OFF // Table Write Protect 02000-03FFF (Disabled)
#pragma config WRT2 = OFF // Table Write Protect 04000-05FFF (Disabled)
#pragma config WRT3 = OFF // Table Write Protect 06000-07FFF (Disabled)
// CONFIG6H
#pragma config WRTC = OFF // Config. Write Protect (Disabled)
#pragma config WRTB = OFF // Table Write Protect Boot (Disabled)
#pragma config WRTD = OFF // Data EE Write Protect (Disabled)
// CONFIG7L
#pragma config EBTR0 = OFF // Table Read Protect 00800-01FFF (Disabled)
#pragma config EBTR1 = OFF // Table Read Protect 02000-03FFF (Disabled)
#pragma config EBTR2 = OFF // Table Read Protect 04000-05FFF (Disabled)
#pragma config EBTR3 = OFF // Table Read Protect 06000-07FFF (Disabled)
// CONFIG7H
#pragma config EBTRB = OFF // Table Read Protect Boot (Disabled)
#include <xc.h>
#include <stdio.h>
#include <stdlib.h>
#define _XTAL_FREQ 8000000L //8MHz??
#define T0_H 0X00//0X66 //TMR0约80毫秒(0X66)
#define T0_L 0X36
#define LD2 PORTBbits.RB3 //??LD2?????
#define LD1 PORTBbits.RB2 //??LD1?????
#define CPU_OUT1 PORTBbits.RB1 //????????????
//高优先中断程序，向量地址0x0008)
void interrupt my_hi_int(void)
{
if(INT0IE && INT0IF)
{
LD2=0; //有外部中断时开LD2发光管
//LD1=0;
INT0IF=0;
}
if(TMR0IE && TMR0IF)
{
if(LATBbits.LATB2) LD1=0; //定时到时取反LD1发光管
else LD1=1;
TMR0IF=0;
TMR0H=T0_H;
TMR0L=T0_L;
}
return;
}
//低优先级中断程序（中断向量0X0018）
void interrupt low_priority my_low_int(void)
{
return;
}
int main() {
TRISBbits.TRISB3=0; //LD2发光管 输出
TRISBbits.TRISB2=0; //LD1发光管 输出
TRISBbits.TRISB1=0; //CPU_OUT1 输出
// 设置TMR0
T0CON=0B00000011; //4分频
TMR0MD=0;
TMR0H=T0_H;
TMR0L=T0_L;
TMR0IF=0;
TMR0IE=1;
TMR0ON=1;
//设置INT0
TRISBbits.TRISB0=1; //CPU_Zero 过零检测RB0设置为输入
INTCON2bits.INTEDG0=1; //上升沿触发
//INTCON2bits.RBPU=0;
//RCONbits.IPEN=1;
INTCONbits.INT0IF=0;
INTCONbits.INT0IE=1;
GIE=1;
LD2=1; //关闭LD2及LD1
LD1=1;
do {
} while (1);
}
------------------------------------------------------------------------------------------
TMR0中断能正常运行，INT0外部中断就是不运行，用LM258集成运放做比较器，输出接INT0,看次脚信号上升沿时间约30uS，是否是这个上升沿不够陡峭造成？
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