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HT66F019 Datasheet(PDF) 140 Page - Holtek Semiconductor Inc

Part # HT66F019
Description  A/D Flash MCU with EEPROM
PDF  175 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT66F019 Datasheet(HTML) 140 Page - Holtek Semiconductor Inc

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Rev. 1.00
140
De�e��e� 01� �01�
Rev. 1.00
141
De�e��e� 01� �01�
HT66F019
A/D Flash MCU with EEPROM
HT66F019
A/D Flash MCU with EEPROM
Thefollowingdiagramshowsthetransmitandreceivewaveformsforboth8-bitand9-bitdata
formats.
Bit 0
8-bit data format
Bit 1
Stop
Bit
Next
Sta�t
Bit
Sta�t
Bit
Pa�ity Bit
Bit �
Bit 3
Bit 4
Bit 5
Bit 6
Bit �
Bit 0
9-bit data format
Bit 1
Sta�t
Bit
Bit �
Bit 3
Bit 4
Bit 5
Bit 6
Stop
Bit
Next
Sta�t
Bit
Pa�ity Bit
Bit 8
Bit �
UART Transmitter
Datawordlengthsofeither8or9bitscanbeselectedbyprogrammingtheBNObitintheUCR1
register.WhenBNObitisset,thewordlengthwillbesetto9bits.Inthiscasethe9thbit,which
istheMSB,needstobestoredintheTX8bitintheUCR1register.Atthetransmittercorelies
theTransmitterShiftRegister,morecommonlyknownastheTSR,whosedataisobtainedfrom
thetransmitdataregister,whichisknownastheTXR_RXRregister.Thedatatobetransmitted
isloadedintothisTXR_RXRregisterbytheapplicationprogram.TheTSRregisterisnotwritten
towithnewdatauntilthestopbitfromtheprevioustransmissionhasbeensentout.Assoonas
thisstopbithasbeentransmitted,theTSRcanthenbeloadedwithnewdatafromtheTXR_RXR
register,ifitisavailable.ItshouldbenotedthattheTSRregister,unlikemanyotherregisters,isnot
directlymappedintotheDataMemoryareaandassuchisnotavailabletotheapplicationprogram
fordirectread/writeoperations.Anactualtransmissionofdatawillnormallybeenabledwhenthe
TXENbitisset,butthedatawillnotbetransmitteduntiltheTXR_RXRregisterhasbeenloaded
withdataandthebaudrategeneratorhasdefinedashiftclocksource.However,thetransmission
canalsobeinitiatedbyfirstloadingdataintotheTXR_RXRregister,afterwhichtheTXENbitcan
beset.Whenatransmissionofdatabegins,theTSRisnormallyempty,inwhichcaseatransferto
theTXR_RXRregisterwillresultinanimmediatetransfertotheTSR.Ifduringatransmissionthe
TXENbitiscleared,thetransmissionwillimmediatelyceaseandthetransmitterwillbereset.The
TXoutputpincanthenbeconfiguredastheI/Oorotherpin-sharedfunction.
Transmitting Data
WhentheUARTistransmittingdata,thedataisshiftedontheTXpinfromtheshiftregister,with
theleastsignificantbitfirst.Inthetransmitmode,theTXR_RXRregisterformsabufferbetween
theinternalbusandthetransmittershiftregister.Itshouldbenotedthatif9-bitdataformathasbeen
selected,thentheMSBwillbetakenfromtheTX8bitintheUCR1register.Thestepstoinitiatea
datatransfercanbesummarizedasfollows:
• MakethecorrectselectionoftheBNO,PRT,PRENandSTOPSbitstodefinetherequiredword
length,paritytypeandnumberofstopbits.
• SetuptheBRGregistertoselectthedesiredbaudrate.
• SettheTXENbittoensurethattheTXpinisusedasaUARTtransmitterpin.
• AccesstheUSRregisterandwritethedatathatistobetransmittedintotheTXR_RXRregister.
NotethatthisstepwillcleartheTXIFbit.
Thissequenceofeventscannowberepeatedtosendadditionaldata.
ItshouldbenotedthatwhenTXIF=0,datawillbeinhibitedfrombeingwrittentotheTXR_RXR
register.ClearingtheTXIFflagisalwaysachievedusingthefollowingsoftwaresequence:
1.AUSRregisteraccess
2.ATXR_RXRregisterwriteexecution



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