HT69F360 datasheet(173/235 Pages) HOLTEK

173 / 235 page

Rev. 1.30

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Rev. 1.30

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HT69F340/HT69F350/HT69F360

TinyPowerTM I/O Flash MCU with LCD & EEPROM

HT69F340/HT69F350/HT69F360

TinyPowerTM I/O Flash MCU with LCD & EEPROM

Thefollowingdiagramshowsthetransmitandreceivewaveformsforboth8-bitand9-bitdata

formats.

St ar t B it

Bi t 0

Bi t 1

Bi t 2

Bi t 3

Bi t 4

Bi t 5

Bi t 6

Bi t 7

St op B it

Ne xt

St ar t

Bi t

Pa ri ty B it

8- Bi t Da ta F or ma t

St ar t B it

Bi t 0

Bi t 1

Bi t 2

Bi t 3

Bi t 4

Bi t 5

Bi t 6

Bi t 7

St op B it

Ne xt

St ar t

Bi t

Pa ri ty B it

9- Bi t Da ta F or ma t

Bi t 8

UART transmitter

Datawordlengthsofeither8or9bits,canbeselectedbyprogrammingtheBNObitintheUCR1

istheMSB,needstobestoredintheTX8bitintheUCR1register.Atthetransmittercoreliesthe

TransmitterShiftRegister,morecommonlyknownastheTSR,whosedataisobtainedfromthe

transmitdataregister,whichisknownastheTXRregister.Thedatatobetransmittedisloaded

intothisTXRregisterbytheapplicationprogram.TheTSRregisterisnotwrittentowithnewdata

untilthestopbitfromtheprevioustransmissionhasbeensentout.Assoonasthisstopbithasbeen

transmitted,theTSRcanthenbeloadedwithnewdatafromtheTXRregister,ifitisavailable.It

shouldbenotedthattheTSRregister,unlikemanyotherregisters,isnotdirectlymappedintothe

DataMemoryareaandassuchisnotavailabletotheapplicationprogramfordirectread/write

operations.AnactualtransmissionofdatawillnormallybeenabledwhentheTXENbitisset,but

thedatawillnotbetransmitteduntiltheTXRregisterhasbeenloadedwithdataandthebaudrate

generatorhasdefinedashiftclocksource.However,thetransmissioncanalsobeinitiatedbyfirst

loadingdataintotheTXRregister,afterwhichtheTXENbitcanbeset.Whenatransmissionof

databegins,theTSRisnormallyempty,inwhichcaseatransfertotheTXRregisterwillresultin

animmediatetransfertotheTSR.IfduringatransmissiontheTXENbitiscleared,thetransmission

willimmediatelyceaseandthetransmitterwillbereset.TheTXoutputpinwillthenreturntotheI/O

orotherpin-sharedfunction.

Transmitting data

WhentheUARTistransmittingdata,thedataisshiftedontheTXpinfromtheshiftregister,with

theleastsignificantbitfirst.Inthetransmitmode,theTXRregisterformsabufferbetweenthe

internalbusandthetransmittershiftregister.Itshouldbenotedthatif9-bitdataformathasbeen

selected,thentheMSBwillbetakenfromtheTX8bitintheUCR1register.Thestepstoinitiatea

datatransfercanbesummarizedasfollows:

• MakethecorrectselectionoftheBNO,PRT,PRENandSTOPSbitstodefinetherequiredword

length,paritytypeandnumberofstopbits.

• SetuptheBRGregistertoselectthedesiredbaudrate.

• SettheTXENbittoensurethattheTXpinisusedasaUARTtransmitterpin.

• AccesstheUSRregisterandwritethedatathatistobetransmittedintotheTXRregister.Note

thatthisstepwillcleartheTXIFbit.

• Thissequenceofeventscannowberepeatedtosendadditionaldata.

ItshouldbenotedthatwhenTXIF=0,datawillbeinhibitedfrombeingwrittentotheTXRregister.

ClearingtheTXIFflagisalwaysachievedusingthefollowingsoftwaresequence:

1.AUSRregisteraccess

2.ATXRregisterwriteexecution

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