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HT45F65 Datasheet(PDF) 202 Page - Holtek Semiconductor Inc |
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HT45F65 Datasheet(HTML) 202 Page - Holtek Semiconductor Inc |
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202 / 231 page  Rev. 1.60 �0� �ove��e� ��� �01� Rev. 1.60 �03 �ove��e� ��� �01� HT45F65/HT45F66/HT45F67 Glucose Meter 8-Bit Flash MCU Address Detect Mode SettingtheAddressDetectfunctionenablecontrolbit,ADDEN,intheUCR2register,enablesthis specialfunction.Ifthisbitissetto1,thenanadditionalqualifierwillbeplacedonthegeneration ofaReceiverDataAvailableinterrupt,whichisrequestedbytheRXIFflag.IftheADDENbit isequalto1,thenwhenthedataisavailable,aninterruptwillonlybegenerated,ifthehighest receivedbithasahighvalue.NotethattherelatedinterruptenablecontrolbitandtheEMIbitofthe microcontrollermustalsobeenabledforcorrectinterruptgeneration.Thehighestaddressbitisthe 9thbitifthebitBNO=1orthe8thbitifthebitBNO=0.Ifthehighestbitishigh,thenthereceived wordwillbedefinedasanaddressratherthandata.ADataAvailableinterruptwillbegenerated everytimethelastbitofthereceivedwordisset.IftheADDENbitisequalto0,thenaReceive DataAvailableinterruptwillbegeneratedeachtimetheRXIFflagisset,irrespectiveofthedatalast butstatus.Theaddressdetectionandparityfunctionsaremutuallyexclusivefunctions.Therefore,if theaddressdetectfunctionisenabled,thentoensurecorrectoperation,theparityfunctionshouldbe disabledbyresettingtheparityfunctionenablebitPRENtozero. ADDEN Bit 9 if BNO=1 Bit 8 if BNO=0 UART Interrupt Generated 0 0 √ 1 √ 1 0 x 1 √ ADDEN Bit Function UART Power Down Mode and Wake-up WhentheMCUisinthePowerDownMode,theUARTwillceasetofunction.Whenthedevice entersthePowerDownMode,allclocksourcestothemoduleareshutdown.IftheMCUentersthe PowerDownModewhileatransmissionisstillinprogress,thenthetransmissionwillbepaused untiltheUARTclocksourcederivedfromthemicrocontrollerisactivated.Inasimilarway,ifthe MCUentersthePowerDownModewhilereceivingdata,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,themulti-functioninterruptenablebit,MF1E,andtheUARTinterrupt enablebit,URE,mustalsobeset.IftheEMIandMF1Ebitsarenotsetthenonlyawakeupevent willoccurandnointerruptwillbegenerated.Notealsothatasittakescertainsystemclockcycles afterawake-upbeforenormalmicrocontrollerresumes,theUARTinterruptwillnotbegenerated untilafterthistimehaselapsed. |
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