单片机基础与Arduino应用（第2版）课件28 Avr 中断

单片机之中断电子信息工程学院空天电子信息国家级实验教学示范中心空天电子信息国家级虚拟仿真实验教学中心中断的原理单片机之中断Command1主程序中断服务程序(ISR)Command2Command3Command4Command5闪灯闪灯闹钟响了（中断源）单片机之中断中断向量表定时器1的三个中断源TIMER1COMPATIMER1COMPBTIMER1OVFPC指针跳转到中断服务程序中断名称中断向量RESET中断0x0000INT00x0002INT10x0004……TIMER1

COMPA0x0016TIMER1

COMPB0x0018TIMER1OVF0x001A…单片机之中断中断向量表中断优先级RESET拥有最高优先级地址越低中断优先级越高高优先级低优先级中断名称中断向量RESET中断0x0000INT00x0002INT10x0004……TIMER1

COMPA0x0016TIMER1

COMPB0x0018TIMER1OVF0x001A…单片机之中断内部与外部中断RESET+2外部中断23内部中断（满足条件时触发）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............外部中断内部中断外部中断内部中断单片机之中断外部中断通过寄存器配置触发外部中断触发类型:上升沿/下降沿/低电平触发外部中断使能寄存器外部中断标志寄存器管脚电平变化中断使能寄存器管脚电平变化中断标志寄存器单片机之中断中断触发条件AddressLabelsCodeComments0x0000jmpRESET;ResetHandler0x0002jmpEXT_INT0;IRQ0Handler0x0004jmpEXT_INT1;IRQ1Handler…0x0016jmpTIM1_COMPA;Timer1CompareAHandler0x0018jmpTIM1_COMPB;Timer1CompareBHandler0x001AjmpTIM1_OVF;Timer1OverflowHandler总开关中断查询模式void

setup(){//

Serial.begin(9600);

cli();pinMode(13,

OUTPUT);

/*

9600

baud

*/

//设置定时器1为1Hz

TCCR1A

=

0;//将整个TCCR1A寄存器设置为0

TCCR1B

=

0;//将整个TCCR1B寄存器设置为0

TCNT1

=

0;//将计数器值初始化为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);//打开CTC模式

TCCR1B

|=

(1

<<

CS12)

|

(1

<<

CS10);//(1024倍预分频)

TIMSK1

|=

(1

<<

OCIE1A);

sei();//打开全局中断}//中断服务程序ISR(TIMER1_COMPA_vect)

{

digitalWrite(13,

flag

?

HIGH

:

LOW);

flag

=

!flag;}单片机之中断中断程序编写int

flag

=

0;