HT67F488 datasheet(127/171 Pages) HOLTEK

127 / 171 page

Rev. 1.60

1�7

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HT67F488/HT67F489

TinyPowerTM A/D 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

√

ADDEN Bit Function

UART Module Power Down 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,andtheUARTinterruptenablebit,URE,mustalsobeset.Ifthesetwo

bitsarenotsetthenonlyawakeupeventwilloccurandnointerruptwillbegenerated.Notealso

thatasittakescertainsystemclockcyclesafterawake-upbeforenormalmicrocontrollerresumes,

theUARTinterruptwillnotbegenerateduntilafterthistimehaselapsed.

BelowtableillustratestheUARTRXwake-upfunctionsindifferentoperatingmode.

HT67F488 Datasheet(PDF) 127 Page - Holtek Semiconductor Inc

HT67F488 Datasheet(HTML) 127 Page - Holtek Semiconductor Inc

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