單片機之中斷電子信息工程學院空天電子信息國家級實驗教學示范中心空天電子信息國家級虛擬仿真實驗教學中心中斷的原理單片機之中斷Command1主程序中斷服務程序(ISR)Command2Command3Command4Command5閃燈閃燈鬧鐘響了（中斷源）單片機之中斷中斷向量表定時器1的三個中斷源TIMER1COMPATIMER1COMPBTIMER1OVFPC指針跳轉到中斷服務程序中斷名稱中斷向量RESET中斷0x0000INT00x0002INT10x0004……TIMER1

COMPA0x0016TIMER1

COMPB0x0018TIMER1OVF0x001A…單片機之中斷中斷向量表中斷優(yōu)先級RESET擁有最高優(yōu)先級地址越低中斷優(yōu)先級越高高優(yōu)先級低優(yōu)先級中斷名稱中斷向量RESET中斷0x0000INT00x0002INT10x0004……TIMER1

COMPA0x0016TIMER1

COMPB0x0018TIMER1OVF0x001A…單片機之中斷內部與外部中斷RESET+2外部中斷23內部中斷（滿足條件時觸發(fā)）AddressLabelsCodeComments0x0000jmpRESET;ResetHandler0x0002jmpEXT_INT0;IRQ0Handler0x0004jmpEXT_INT1;IRQ1Handler0x0006jmpPCINT0;PCINT0Handler0x0008jmpPCINT1;PCINT1Handler0x000AjmpPCINT2;PCINT2Handler0x000CjmpWDT;WatchdogTimerHandler0x000EjmpTIM2_COMPA;Timer2CompareAHandler0x0010jmpTIM2_COMPB;Timer2CompareBHandler0x0012jmpTIM2_OVF;Timer2OverflowHandler0x0014jmpTIM1_CAPT;Timer1CaptureHandler0x0016jmpTIM1_COMPA;Timer1CompareAHandler0x0018jmpTIM1_COMPB;Timer1CompareBHandler0x001AjmpTIM1_OVF;Timer1OverflowHandler0x001CjmpTIM0_COMPA;Timer0CompareAHandler0x001EjmpTIM0_COMPB;Timer0CompareBHandler0x0020jmpTIM0_OVF;Timer0OverflowHandler0x0022jmpSPI_STC;SPITransferCompleteHandler0x0024jmpUSART_RXC;USART,RXCompleteHandler0x0026jmpUSART_UDRE;USART,UDREmptyHandler0x0028jmpUSART_TXC;USART,TXCompleteHandler0x002AjmpADC;ADCConversionCompleteHandler0x002CjmpEE_RDY;EEPROMReadyHandler0x002EjmpANA_COMP;AnalogComparatorHandler0x0030jmpTWI;2-wireSerialInterfaceHandler0x0032jmpSPM_RDY;StoreProgramMemoryReadyHandler;0x0033RESET:ldir16,high(RAMEND);Mainprogramstart0x0034outSPH,r16;SetStackPointertotopofRAM0x0035ldir16,low(RAMEND)0x0036outSPL,r160x0037sei;Enableinterrupts0x0038<instr>xxx............外部中斷內部中斷外部中斷內部中斷單片機之中斷外部中斷通過寄存器配置觸發(fā)外部中斷觸發(fā)類型:上升沿/下降沿/低電平觸發(fā)外部中斷使能寄存器外部中斷標志寄存器管腳電平變化中斷使能寄存器管腳電平變化中斷標志寄存器單片機之中斷中斷觸發(fā)條件AddressLabelsCodeComments0x0000jmpRESET;ResetHandler0x0002jmpEXT_INT0;IRQ0Handler0x0004jmpEXT_INT1;IRQ1Handler…0x0016jmpTIM1_COMPA;Timer1CompareAHandler0x0018jmpTIM1_COMPB;Timer1CompareBHandler0x001AjmpTIM1_OVF;Timer1OverflowHandler總開關中斷查詢模式void

setup(){//

Serial.begin(9600);

cli();pinMode(13,

OUTPUT);

/*

9600

baud

*/

//設置定時器1為1Hz

TCCR1A

=

0;//將整個TCCR1A寄存器設置為0

TCCR1B

=

0;//將整個TCCR1B寄存器設置為0

TCNT1

=

0;//將計數器值初始化為0

uint32_t

ms

=

1000;

ms

=

1000

*

(16000

/

1024);

OCR1AH

=

((ms-1)

&

0xff00)

>>

8;//

15625

高位

OCR1AL

=

(ms-1)

&

0x00ff;

//

15625

低位

TCCR1B

|=

(1

<<

WGM12);//打開CTC模式

TCCR1B

|=

(1

<<

CS12)

|

(1

<<

CS10);//(1024倍預分頻)

TIMSK1

|=

(1

<<

OCIE1A);

sei();//打開全局中斷}//中斷服務程序ISR(TIMER1_COMPA_vect)

{

digitalWrite(13,

flag

?

HIGH

:

LOW);

flag

=

!flag;}單片機之中斷中斷程序編寫int

flag

=

0;