2009年11月2日 第6-1章_中断系统 双语教学_黄英_《单片机原理及应用》讲义(1)new

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1、Chapter6InterruptSystemandTimerSystem主讲教师：黄英6.1InterruptsystemContents：6.1.1IntroductionofInterruptTechnology16.1.2InterruptSources11.ExternalInterrupts12.TimerInterrupts23.SerialPortInterrupt26.1.3InterruptControl21.Timer/CounterControlRegister（TCON）22.SerialPortControlRegister（SCON）33.InterruptEna

2、bleRegister（IE）34.InterruptPriorityRegister（IP）45.InterruptPriorityControlRules46.InterruptInitialization56.1.4InterruptProcess51.InterruptSample52.InterruptQuery53.InterruptResponse54.InterruptRequestRepeal66.1.5FlowChartofInterruptService76.1.1IntroductionofInterruptTechnology·Aeffectivemethodtoso

3、lveresourcecompetition.·Letsmultitaskshareoneresource:Resourcesharingtechnology.·Mainlyusedinrealtimecontrol.6.1.2InterruptSources·8051provides5interruptsources:TwoexternalinterruptsTwotimerinterruptsOneserialportinterrupt·5interruptvectorsareassignedinafixedlocation.（1）SerialPortinterrupt：0023H～002

4、AH（8bytes）（2）Timer/Counter1interrupt：001BH～0022H（8bytes）（3）ExternalInterrupt1：0013H～001AH（8bytes）（4）Timer/Counter0interrupt：000BH～0012H（8bytes）（5）ExternalInterrupt0：0003H～000AH（8bytes）·TheinterruptcausestheCPUtojumptotherelatedlocation,whereithasano-conditionjumpinstruction（LJMP/AJMP/SJMP）pointedtos

5、erviceroutine.1.ExternalInterrupts·ExternalInterrupts:/P3.2,/P3.3（generatedfromexternaldevice）·SignalModes:（1）LowLevelactive（2）Fallingedgeactive第7页，共7页2.TimerInterrupts·Timer0,Timer1·Whencountingoverflows:Atimerinterruptisgenerated.Timeroverflowflag（TF0/TF1）issetbyinternalhardwarecircuit.3.SerialPor

6、tInterrupt·Whenserialportreceives/transmitsagroupofserialdata:Aserialportinterruptisgenerated.ReceiveFlag/TransmitFlag（RI/TI）issetbyinternalhardwarecircuit.6.1.3InterruptControlTherearefourinterruptcontrolregisters:TCON,SCON,IE,IP.1.Timer/CounterControlRegister（TCON）·Celladdress:88H·Bitaddresses:8FH

7、～88Hgoback·RelatedBits:TF0/TF1，IE0/IE1，IT0/IT1第7页，共7页2.SerialPortControlRegister（SCON）Celladdress:98Hbitaddresses:9FH～98HRelatedBits:TI,RI3.InterruptEnableRegister（IE）Celladdress:0A8Hbitaddresses:0AFH