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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT69F360 데이터시트(PDF) 178 Page - Holtek Semiconductor Inc |
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HT69F360 데이터시트(HTML) 178 Page - Holtek Semiconductor Inc |
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178 / 235 page  Rev. 1.30 17� �ove��e� 1�� �01� Rev. 1.30 179 �ove��e� 1�� �01� HT69F340/HT69F350/HT69F360 TinyPowerTM I/O Flash MCU with LCD & EEPROM HT69F340/HT69F350/HT69F360 TinyPowerTM I/O Flash MCU with LCD & EEPROM Address detect mode SettingtheAddressDetectModebit,ADDEN,intheUCR2register,enablesthisspecialmode.If thisbitisenabledthenanadditionalqualifierwillbeplacedonthegenerationofaReceiverData Availableinterrupt,whichisrequestedbytheRXIFflag.IftheADDENbitisenabled,thenwhen dataisavailable,aninterruptwillonlybegenerated,ifthehighestreceivedbithasahighvalue. NotethattheMFE,UREandEMIinterruptenablebitsmustalsobeenabledforcorrectinterrupt generation.Thishighestaddressbitisthe9thbitifBNO=1orthe8thbitifBNO=0.Ifthisbit ishigh,thenthereceivedwordwillbedefinedasanaddressratherthandata.ADataAvailable interruptwillbegeneratedeverytimethelastbitofthereceivedwordisset.IftheADDENbit isnotenabled,thenaReceiverDataAvailableinterruptwillbegeneratedeachtimetheRXIF flagisset,irrespectiveofthedatalastbitstatus.Theaddressdetectmodeandparityenableare mutuallyexclusivefunctions.Thereforeiftheaddressdetectmodeisenabled,thentoensurecorrect operation,theparityfunctionshouldbedisabledbyresettingtheparityenablebittozero. ADDEN Bit 9 if BNO=1, Bit 8 if BNO=0 UART Interrupt Generated 0 0 √ 1 √ 1 0 × 1 √ ADDEN Bit Function UART Module Power Down and Wake-up WhenthefSYSisoff,theUARTwillceasetofunction.Allclocksourcestothemoduleareshutdown. IfthefSYSisoffwhileatransmissionisstillinprogress,thenthetransmissionwillbepauseduntil theUARTclocksourcederivedfromthemicrocontrollerisactivated.Inasimilarway,iftheMCU entersthePowerDownModewhilereceivingdata,thenthereceptionofdatawilllikewisebe paused.WhentheMCUentersthePowerDownMode,notethattheUSR,UCR1,UCR2,transmit andreceiveregisters,aswellastheBRGregisterwillnotbeaffected.Itisrecommendedtomake surefirstthattheUARTdatatransmissionorreceptionhasbeenfinishedbeforethemicrocontroller entersthePowerDownmode. TheUARTfunctioncontainsareceiverRXpinwake-upfunction,whichisenabledordisabled bytheWAKEbitintheUCR2register.Ifthisbit,alongwiththeUARTenablebit,UARTEN,the receiverenablebit,RXENandthereceiverinterruptbit,RIE,areallsetbeforetheMCUenters thePowerDownMode,thenafallingedgeontheRXpinwillwakeuptheMCUfromthePower DownMode.Notethatasittakescertainsystemclockcyclesafterawake-up,beforenormal microcontrolleroperationresumes,anydatareceivedduringthistimeontheRXpinwillbeignored. ForaUARTwake-upinterrupttooccur,inadditiontothebitsforthewake-upbeingset,theglobal interruptenablebit,EMI,andtheUARTinterruptenablebit,UARE,mustalsobeset.Ifthesetwo bitsarenotsetthenonlyawakeupeventwilloccurandnointerruptwillbegenerated.Notealso thatasittakescertainsystemclockcyclesafterawake-upbeforenormalmicrocontrollerresumes, theUARTinterruptwillnotbegenerateduntilafterthistimehaselapsed. |
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