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HT66F20 Datasheet(PDF) 253 Page - Holtek Semiconductor Inc

Part # HT66F20
Description  Enhanced A/D Flash Type 8-Bit MCU with EEPROM
PDF  298 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT66F20 Datasheet(HTML) 253 Page - Holtek Semiconductor Inc

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HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
Enhanced A/D Flash Type 8-Bit MCU with EEPROM
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
Enhanced A/D Flash Type 8-Bit MCU with EEPROM
• Data,parityandstopbitselection
Theformatofthedatatobetransferrediscomposedofvariousfactorssuchasdatabitlength,
parityon/off,paritytype,addressbitsandthenumberofstopbits.Thesefactorsaredetermined
bythesetupofvariousbitswithintheUCR1register.TheBNObitcontrolsthenumberofdata
bitswhichcanbesettoeither8or9.ThePRTbitcontrolsthechoiceifoddorevenparity.The
PRENbitcontrolstheparityon/offfunction.TheSTOPSbitdecideswhetheroneortwostop
bitsaretobeused.Thefollowingtableshowsvariousformatsfordatatransmission.Theaddress
detectmodecontrolbitidentifiestheframeasanaddresscharacter.Thenumberofstopbits,
whichcanbeeitheroneortwo,isindependentofthedatalength.
Start Bit
Data Bits
Address Bits
Parity Bits
Stop Bit
Example of 8-bit Data Formats
1
8
0
0
1
1
7
0
1
1
1
7
1
0
1
Example of 9-bit Data Formats
1
9
0
0
1
1
8
0
1
1
1
8
1
0
1
Transmitter Receiver Data Format
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
• UARTtransmitter
Datawordlengthsofeither8or9bitscanbeselectedbyprogrammingtheBNObitintheUCR1
register.WhenBNObitisset,thewordlengthwillbesetto9bits.Inthiscasethe9thbit,which
istheMSB,needstobestoredintheTX8bitintheUCR1register.Atthetransmittercorelies
theTransmitterShiftRegister,morecommonlyknownastheTSR,whosedataisobtainedfrom
thetransmitdataregister,whichisknownastheTXRregister.Thedatatobetransmittedis
loadedintothisTXRregisterbytheapplicationprogram.TheTSRregisterisnotwrittentowith
newdatauntilthestopbitfromtheprevioustransmissionhasbeensentout.Assoonasthisstop
bithasbeentransmitted,theTSRcanthenbeloadedwithnewdatafromtheTXRregister,ifit
isavailable.ItshouldbenotedthattheTSRregister,unlikemanyotherregisters,isnotdirectly
mappedintotheDataMemoryareaandassuchisnotavailabletotheapplicationprogramfor
directread/writeoperations.Anactualtransmissionofdatawillnormallybeenabledwhenthe
TXENbitisset,butthedatawillnotbetransmitteduntiltheTXRregisterhasbeenloadedwith
dataandthebaudrategeneratorhasdefinedashiftclocksource.However,thetransmissioncan
alsobeinitiatedbyfirstloadingdataintotheTXRregister,afterwhichtheTXENbitcanbeset.
Whenatransmissionofdatabegins,theTSRisnormallyempty,inwhichcaseatransfertothe
TXRregisterwillresultinanimmediatetransfertotheTSR.IfduringatransmissiontheTXEN
bitiscleared,thetransmissionwillimmediatelyceaseandthetransmitterwillbereset.TheTX
outputpinwillthenreturntothehighimpedancestate.



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