HT45F4MA datasheet(94/145 Pages) HOLTEK

94 / 145 page

Rev. 1.20

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Rev. 1.20

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HT45F4MA/HT45FH4MA/HT45FH4MA-1

Power Bank Flash MCU

HT45F4MA/HT45FH4MA/HT45FH4MA-1

Power Bank Flash MCU

A/D Converter Data Registers – ADRL, ADRH

Asthedevicescontainaninternal12-bitA/Dconverter,theyrequiretwodataregisterstostorethe

convertedvalue.Theseareahighbyteregister,knownasADRH,andalowbyteregister,known

asADRL.Aftertheconversionprocesstakesplace,theseregisterscanbedirectlyreadbythe

microcontrollertoobtainthedigitisedconversionvalue.Asonly12bitsofthe16-bitregisterspace

isutilised,theformatinwhichthedataisstorediscontrolledbytheADRFSbitintheADCR0

registerasshownintheaccompanyingtable.D0~D11aretheA/Dconversionresultdatabits.Any

unusedbitswillbereadaszero.

ADRFS

ADRH

ADRL

D11 D10 D9 D8 D7 D� D5 D� D3 D2 D1 D0

A/D Data Registers

A/D Converter Control Registers – ADCR0, ADCR1, ACERL

TocontrolthefunctionandoperationoftheA/Dconverter,threecontrolregistersknownasADCR0,

ADCR1andACERLareprovided.These8-bitregistersdefinefunctionssuchastheselectionof

whichanalogchannelisconnectedtotheinternalA/Dconverter,thedigitiseddataformat,theA/

DclocksourceaswellascontrollingthestartfunctionandmonitoringtheA/Dconverterendof

conversionstatus.TheACS3~ACS0bitsintheADCR0registerandACS4bitistheADCR1register

definetheADCinputchannelnumber.Asthedevicecontainsonlyoneactualanalogtodigital

converterhardwarecircuit,eachoftheindividual8analoginputsmustberoutedtotheconverter.It

isthefunctionoftheACS4~ACS0bitstodeterminewhichanalogchannelinputsignalsorinternal

1.25VisactuallyconnectedtotheinternalA/Dconverter.

TheACERLcontrolregistercontainstheACE7~ACE0bitswhichdeterminewhichpinsonPortA

areusedasanaloginputsfortheA/DconverterinputandwhichpinsarenottobeusedastheA/D

converterinput.SettingthecorrespondingbithighwillselecttheA/Dinputfunction,clearingthe

bittozerowillselecteithertheI/Oorotherpin-sharedfunction.Whenthepinisselectedtobean

A/Dinput,itsoriginalfunctionwhetheritisanI/Oorotherpin-sharedfunctionwillberemoved.In

addition,anyinternalpull-highresistorsconnectedtothesepinswillbeautomaticallyremovedifthe

pinisselectedtobeanA/Dinput.

HT45F4MA Datasheet(PDF) 94 Page - Holtek Semiconductor Inc