HT66F007 datasheet(90/131 Pages) HOLTEK

90 / 131 page

Rev. 1.41

April 11, 2017

Rev. 1.41

April 11, 2017

HT66F007/HT66F008

Cost-Effective A/D Flash MCU with EEPROM

HT66F007/HT66F008

Cost-Effective A/D Flash MCU with EEPROM

A/D Converter Data Registers – ADRL, ADRH

Asthedevicescontainaninternal12-bitA/Dconverter,itrequirestwodataregisterstostorethe

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

D6 D5 D4 D3 D2 D1 D0

D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

A/D Data Registers

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

TocontrolthefunctionandoperationoftheA/Dconverter,threecontrolregistersknownasADCR0,

ADCR1,ACERareprovided.These8-bitregistersdefinefunctionssuchastheselectionofwhich

analogchannelisconnectedtotheinternalA/Dconverter,thedigitiseddataformat,theA/Dclock

sourceaswellascontrollingthestartfunctionandmonitoringtheA/Dconverterendofconversion

status.TheACS2~ACS0bitsintheADCR0registerandtheACS4bitintheADCR1registerdefine

theADCinputchannelnumber.Asthedevicescontainonlyoneactualanalogtodigitalconverter

hardwarecircuit,eachoftheindividual5analoginputsmustberoutedtotheconverter.Itisthe

functionoftheACS4,ACS2~ACS0bitstodeterminewhichanalogchannelinputsignalsorinternal

1.25VisactuallyconnectedtotheinternalA/Dconverter.

TheACERcontrolregistercontainstheACE4~ACE0bitswhichdeterminewhichpinsonPortA

areusedasanaloginputsfortheA/DconverterinputandwhichpinsarenottobeusedastheA/D

converterinput.SettingthecorrespondingbithighwillselecttheA/Dinputfunction,clearingthe

bittozerowillselecteithertheI/Oorotherpin-sharedfunction.Whenthepinisselectedtobean

A/Dinput,itsoriginalfunctionwhetheritisanI/Oorotherpin-sharedfunctionwillberemoved.In

addition,anyinternalpull-highresistorsconnectedtothesepinswillbeautomaticallyremovedifthe

pinisselectedtobeanA/Dinput.

HT66F007 Datasheet(PDF) 90 Page - Holtek Semiconductor Inc