單片機(jī)基礎(chǔ)與Arduino應(yīng)用（第2版）課件28 Avr 中斷

單片機(jī)之中斷電子信息工程學(xué)院空天電子信息國(guó)家級(jí)實(shí)驗(yàn)教學(xué)示范中心空天電子信息國(guó)家級(jí)虛擬仿真實(shí)驗(yàn)教學(xué)中心中斷的原理單片機(jī)之中斷Command1主程序中斷服務(wù)程序(ISR)Command2Command3Command4Command5閃燈閃燈鬧鐘響了（中斷源）單片機(jī)之中斷中斷向量表定時(shí)器1的三個(gè)中斷源TIMER1COMPATIMER1COMPBTIMER1OVFPC指針跳轉(zhuǎn)到中斷服務(wù)程序中斷名稱(chēng)中斷向量RESET中斷0x0000INT00x0002INT10x0004……TIMER1

COMPA0x0016TIMER1

COMPB0x0018TIMER1OVF0x001A…單片機(jī)之中斷中斷向量表中斷優(yōu)先級(jí)RESET擁有最高優(yōu)先級(jí)地址越低中斷優(yōu)先級(jí)越高高優(yōu)先級(jí)低優(yōu)先級(jí)中斷名稱(chēng)中斷向量RESET中斷0x0000INT00x0002INT10x0004……TIMER1

COMPA0x0016TIMER1

COMPB0x0018TIMER1OVF0x001A…單片機(jī)之中斷內(nèi)部與外部中斷RESET+2外部中斷23內(nèi)部中斷（滿(mǎn)足條件時(shí)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(nèi)部中斷外部中斷內(nèi)部中斷單片機(jī)之中斷外部中斷通過(guò)寄存器配置觸發(fā)外部中斷觸發(fā)類(lèi)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(biāo)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(biāo)志寄存器單片機(jī)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(kāi)關(guān)中斷查詢(xún)模式void

setup(){//

Serial.begin(9600);

cli();pinMode(13,

OUTPUT);

/*

9600

baud

*/

//設(shè)置定時(shí)器1為1Hz

TCCR1A

=

0;//將整個(gè)TCCR1A寄存器設(shè)置為0

TCCR1B

=

0;//將整個(gè)TCCR1B寄存器設(shè)置為0

TCNT1

=

0;//將計(jì)數(shù)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(kāi)CTC模式

TCCR1B

|=

(1

<<

CS12)

|

(1

<<

CS10);//(1024倍預(yù)分頻)

TIMSK1

|=

(1

<<

OCIE1A);

sei();//打開(kāi)全局中斷}//中斷服務(wù)程序ISR(TIMER1_COMPA_vect)

{

digitalWrite(13,

flag

?

HIGH

:

LOW);

flag

=

!flag;}單片機(jī)之中斷中斷程序編寫(xiě)int

flag

=

0;