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- #include<iom128v.h>
- #define uchar unsigned char
- #define uint unsigned int
- #pragma interrupt_handler timer1:15/*定時器溢出中斷向量標(biāo)號*/
- uchar t=0;
- void timer1()
- {
- TCNT1H=(65536-50000)/256;
- TCNT1L=(65536-50000)%256;
- t++;
- if(t==20)
- {
- t=0;
- PORTA=~PORTA;
- PORTA|=0xfe;
- }
- }
- void IO_init()
- {
- DDRA=0xff;
- PORTA=0xff;
- }
- void T1_init()
- {
- TCNT1H=(65536-50000)/256;//50ms溢出中斷
- TCNT1L=(65536-50000)%256;
- TCCR1B=0x02;//8分頻，8MHz晶振，1us
- TIMSK=0x04;
- SREG=0x80;
- }
- main()
- {
- IO_init();
- T1_init();
- while(1)
- {
- ;
- }
- }
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