100000秒以内记数器。
本例程是用外部中断，按一下开始记数，再按一下停止，再按一下清零。
以下是Proteus的运行截图：
以下是Studio6.2的程序的截图：
程序清单：
- /*
- * GccApplication5.c
- *
- * Created: 2014-10-29 20:19:55
- * Author: Administrator
- */
- #define F_CPU 4000000UL
- #include <avr/io.h>
- #include <avr/interrupt.h>
- #include <util/delay.h>
- #include <stdint.h>
- const uint8_t SEG_CODE[] = {0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
- uint8_t Digits_Buffer[] = {0,0,0,0,0,0};
-
- void Show_Count_ON_DSY()
- {
- uint8_t i;
- for(i=0;i<=5;i++)
- {
- PORTC = 0x00;
- PORTA = ~_BV(5-i);
- PORTC = SEG_CODE[Digits_Buffer[i]];
- if(i==1)PORTC |= 0x80;
- _delay_ms(3);
- }
- }
- int main(void)
- {
- DDRA = 0xFF;PORTA = 0xFF;
- DDRC = 0xFF;PORTC = 0xFF;
- DDRD = 0x00;PORTD = 0xFF;
- MCUCR = 0x02;
- GICR = 0x40;
- TCNT1 = 65536 - F_CPU/8*0.1;
- TIMSK = _BV(TOIE1);
- sei();
- while(1) Show_Count_ON_DSY();
- }
- ISR(TIMER1_OVF_vect)
- {
- uint8_t i;
- TCNT1 = 65536-F_CPU/8*0.1;
- Digits_Buffer[0]++;
- for(i=0;i<=5;i++)
- {
- if(Digits_Buffer[i] == 10)
- {
- Digits_Buffer[i]=0;
- if(i!=5) Digits_Buffer[i+1]++;
- }
- else break;
- }
- }
- ISR(INT0_vect)
- {
- uint8_t i;
- static uint8_t KeyOperation = 0;
- if(++KeyOperation==3)KeyOperation=0;
- switch(KeyOperation)
- {
-
- case 0:TCCR1B = 0x00;
- for(i=0;i<6;i++)Digits_Buffer[i] = 0;
- break;
- case 1:TCCR1B = 0x02;
- break;
- case 2:TCCR1B = 0x00;
- break;
- }
- }
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