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HT66F019 Datasheet(PDF) 144 Page - Holtek Semiconductor Inc |
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HT66F019 Datasheet(HTML) 144 Page - Holtek Semiconductor Inc |
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144 / 175 page  Rev. 1.00 144 De�e��e� 01� �01� Rev. 1.00 145 De�e��e� 01� �01� HT66F019 A/D Flash MCU with EEPROM HT66F019 A/D Flash MCU with EEPROM UART Interrupt Structure SeveralindividualUARTconditionscangenerateaUARTinterrupt.Whentheseconditionsexist, alowpulsewillbegeneratedtogettheattentionofthemicrocontroller.Theseconditionsarea transmitterdataregisterempty,transmitteridle,receiverdataavailable,receiveroverrun,address detectandanRXpinwake-up.Whenanyoftheseconditionsarecreated,iftheglobalinterrupt enablebitanditscorrespondinginterruptcontrolbitareenabledandthestackisnotfull,the programwilljumptoitscorrespondinginterruptvectorwhereitcanbeservicedbeforereturningto themainprogram.FouroftheseconditionshavethecorrespondingUSRregisterflagswhichwill generateaUARTinterruptifitsassociatedinterruptenablecontrolbitintheUCR2registerisset. Thetwotransmitterinterruptconditionshavetheirowncorrespondingenablecontrolbits,whilethe tworeceiverinterruptconditionshaveasharedenablecontrolbit.Theseenablebitscanbeusedto maskoutindividualUARTinterruptsources. Theaddressdetectcondition,whichisalsoaUARTinterruptsource,doesnothaveanassociated flag,butwillgenerateaUARTinterruptwhenanaddressdetectconditionoccursifitsfunctionis enabledbysettingtheADDENbitintheUCR2register.AnRXpinwake-up,whichisalsoaUART interruptsource,doesnothaveanassociatedflag,butwillgenerateaUARTinterruptiftheUART clock(fH)sourceisswitchedoffandtheWAKEandRIEbitsintheUCR2registeraresetwhena fallingedgeontheRXpinoccurs. NotethattheUSRregisterflagsarereadonlyandcannotbeclearedorsetbytheapplication program,neitherwilltheybeclearedwhentheprogramjumpstothecorrespondinginterrupt servicingroutine,asisthecaseforsomeoftheotherinterrupts.Theflagswillbecleared automaticallywhencertainactionsaretakenbytheUART,thedetailsofwhicharegiveninthe UARTregistersection.TheoverallUARTinterruptcanbedisabledorenabledbytherelated interruptenablecontrolbitsintheinterruptcontrolregistersofthemicrocontrollertodecidewhether theinterruptrequestedbytheUARTmoduleismaskedoutorallowed. T�ans�itte� E�pty Flag TXIF UnSR Registe� T�ans�itte� Idle Flag TIDLE Re�eive� Ove��un Flag OERR Re�eive� Data Availa�le RXIF ADDEN RX Pin Wake-up WAKE 0 1 0 1 RX� if BNO=0 RX8 if BNO=1 UCR� Registe� RIE 0 1 TIIE 0 1 TEIE 0 1 UART Inte��upt Request Flag URF UCR� Registe� URE EMI 0 1 Inte��upt signal to MCU UART Interrupt Structure |
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