HT66F4530 datasheet(160/224 Pages) HOLTEK

160 / 224 page

Rev. 1.00

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HT66F4530/HT66F4540/HT66F4550

A/D Flash MCU with Dual Operational Amplifiers

HT66F4530/HT66F4540/HT66F4550

A/D Flash MCU with Dual Operational Amplifiers

Duringadatatransmission,awriteinstructiontotheTXR_RXRregisterwillplacethedataintothe

TXR_RXRregister,whichwillbecopiedtotheshiftregisterattheendofthepresenttransmission.

Whenthereisnodatatransmissioninprogress,awriteinstructiontotheTXR_RXRregisterwill

placethedatadirectlyintotheshiftregister,resultinginthecommencementofdatatransmission,

andtheTXIFbitbeingimmediatelyset.Whenaframetransmissioniscomplete,whichhappens

afterstopbitsaresentorafterthebreakframe,theTIDLEbitwillbeset.TocleartheTIDLEbitthe

followingsoftwaresequenceisused:

1.AUSRregisteraccess

2.ATXR_RXRregisterwriteexecution

NotethatboththeTXIFandTIDLEbitsareclearedbythesamesoftwaresequence.

Transmit Break

IftheTXBRKbitissetthenbreakcharacterswillbesentonthenexttransmission.Breakcharacter

transmissionconsistsofastartbit,followedby13×N‘0’bitsandstopbits,whereN=1,2,etc.Ifa

breakcharacteristobetransmittedthentheTXBRKbitmustbefirstsetbytheapplicationprogram,

andthenclearedtogeneratethestopbits.Transmittingabreakcharacterwillnotgenerateatransmit

interrupt.Notethatabreakconditionlengthisatleast13bitslong.IftheTXBRKbitiscontinually

keptatalogichighlevelthenthetransmittercircuitrywilltransmitcontinuousbreakcharacters.

AftertheapplicationprogramhasclearedtheTXBRKbit,thetransmitterwillfinishtransmittingthe

lastbreakcharacterandsubsequentlysendoutoneortwostopbits.Theautomaticlogichighatthe

endofthelastbreakcharacterwillensurethatthestartbitofthenextframeisrecognized.

UART Receiver

TheUARTiscapableofreceivingwordlengthsofeither8or9bits.IftheBNObitisset,theword

lengthwillbesetto9bitswiththeMSBbeingstoredintheRX8bitoftheUCR1register.Atthe

receivercoreliestheReceiveSerialShiftRegister,commonlyknownastheRSR.Thedatawhich

isreceivedontheRXexternalinputpinissenttothedatarecoveryblock.Thedatarecoveryblock

operatingspeedis16timesthatofthebaudrate,whilethemainreceiveserialshifteroperatesatthe

baudrate.AftertheRXpinissampledforthestopbit,thereceiveddatainRSRistransferredtothe

receivedataregister,iftheregisterisempty.ThedatawhichisreceivedontheexternalRXinputpin

issampledthreetimesbyamajoritydetectcircuittodeterminethelogiclevelthathasbeenplaced

ontotheRXpin.ItshouldbenotedthattheRSRregister,unlikemanyotherregisters,isnotdirectly

mappedintotheDataMemoryareaandassuchisnotavailabletotheapplicationprogramfordirect

read/writeoperations.

Receiving Data

WhentheUARTreceiverisreceivingdata,thedataisseriallyshiftedinontheexternalRXinput

pin,LSBfirst.Inthereadmode,theTXR_RXRregisterformsabufferbetweentheinternalbus

andthereceivershiftregister.TheTXR_RXRregisterisatwobytedeepFIFOdatabuffer,where

twobytescanbeheldintheFIFOwhileathirdbytecancontinuetobereceived.Notethatthe

applicationprogrammustensurethatthedataisreadfromTXR_RXRbeforethethirdbytehasbeen

completelyshiftedin,otherwisethisthirdbytewillbediscardedandanoverrunerrorOERRwillbe

subsequentlyindicated.Thestepstoinitiateadatatransfercanbesummarizedasfollows:

• MakethecorrectselectionofBNO,PRTandPRENbitstodefinethewordlengthandparitytype.

• SetuptheBRGregistertoselectthedesiredbaudrate.

• SettheRXENbittoensurethattheRXpinisusedasaUARTreceiverpin.

Atthispointthereceiverwillbeenabledwhichwillbegintolookforastartbit.

HT66F4530 Datasheet(PDF) 160 Page - Holtek Semiconductor Inc

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