本程序，同时允许INT0,INT1中断。GICR = 0XC0也可写作 GICR = _BV(INT0) | _BV(INT1);
MCUCR = 0x0A是将两个中断设为下降沿触发.
以下是仿真的电路图：
以下是Studion6.2编译截图：
以下是程序：
/*
* GccApplication20.c
*
* Created: 2014-10-16 21:18:46
* Author: Administrator
*/
#define F_CPU 0x8000000UL
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <stdint.h>
#define K1_CLEAR_ON() ((PIND & 0x10)== 0x00)
#define K2_CLEAR_ON() ((PIND & 0x20)== 0x00)
const uint8_t SEG_CODE[] = { 0xc0,0xf9,0xa4,0x80,0x99,0x92,0x82,0xf8,0x80,0x90,0xff};
const uint8_t SCAN_BITs[] = {0x20,0x10,0x08,0x04,0x02,0x01};
uint8_t Buffer_Counts[] = {0,0,0,0,0,0};
uint16_t Count_A = 0,Count_B = 0;
void Show_Counts()
{
uint8_t i;
Buffer_Counts[2] = Count_A/100;
Buffer_Counts[1] = Count_A %100/10;
Buffer_Counts[0] = Count_A %10;
if(Buffer_Counts[2]== 0)
{
Buffer_Counts[2] = 10;
if(Buffer_Counts[1] == 0) Buffer_Counts[1] = 10;
}
Buffer_Counts[5] = Count_B/100;
Buffer_Counts[4] = Count_B % 100 /10;
Buffer_Counts[3] = Count_B % 10;
if(Buffer_Counts[5] == 0)
{
Buffer_Counts[5] = 10;
if(Buffer_Counts[4] == 0)Buffer_Counts[4] = 10;
}
for(i=0;i<6;i++)
{
PORTC = SCAN_BITs[i];
PORTB = SEG_CODE[Buffer_Counts[i]];
_delay_ms(1);
}
}
int main(void)
{
DDRB = 0xFF;PORTB = 0xFF;
DDRC = 0xFF;PORTC = 0xFF;
DDRD = 0x00;PORTD = 0xFF;
MCUCR = 0x0A;
GICR = 0xC0;
sei();
while(1)
{
if(K1_CLEAR_ON())Count_A = 0;
if(K2_CLEAR_ON())Count_B = 0;
Show_Counts();
}
}
ISR(INT0_vect)
{
Count_A++;
}
ISR(INT1_vect)
{
Count_B++;
}
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