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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT67F488 데이터시트(PDF) 95 Page - Holtek Semiconductor Inc |
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HT67F488 데이터시트(HTML) 95 Page - Holtek Semiconductor Inc |
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95 / 171 page  Rev. 1.60 95 �ove��e� ��� �016 HT67F488/HT67F489 TinyPowerTM A/D Flash MCU with LCD & EEPROM ADCR1 Register Bit 7 6 5 4 3 2 1 0 �a�e ACS4 VBGE� — VREFS — ADCK� ADCK1 ADCK0 R/W R/W R/W — R/W — R/W R/W R/W POR 0 0 — 0 — 0 0 0 Bit7 ACS4:SelectinternalVBGasADCinputcontrol 0:Disable 1:Enable ThisbitenablesVBGtobeconnectedtotheA/Dconverter.TheVBGENbitmust firsthavebeensettoenablethebandgapcircuitVBGvoltagetobeusedbytheA/D converter.WhentheACS4bitissethigh,thebandgapVBGvoltagewillberoutedto theA/DconverterandtheotherA/Dinputchannelsdisconnected. Bit6 VBGEN:InternalVBGcontrol 0:Disable 1:Enable ThisbitcontrolstheinternalBandgapcircuiton/offfunctiontotheA/Dconverter. WhenthebitissethighthebandgapvoltageVBGcanbeusedbytheA/Dconverter.If VBGisnotusedbytheA/DconverterandtheLVR/LVDfunctionisdisabledthenthe bandgapreferencecircuitwillbeautomaticallyswitchedofftoconservepower.When VBGisswitchedonforusebytheA/Dconverter,atimetBGshouldbeallowedforthe bandgapcircuittostabilisebeforeimplementinganA/Dconversion. Bit5 Unimplemented,readas“0” Bit4 VREFS:SelecteADCreferencevoltage 0:InternalADCpower 1:VREFpin ThisbitisusedtoselectthereferencevoltagefortheA/Dconverter.Ifthebitishigh, thentheA/DconverterreferencevoltageissuppliedontheexternalVREFpin.Ifthe pinislow,thentheinternalreferenceisusedwhichistakenfromthepowersupplypin VDD.WhentheA/DconverterreferencevoltageissuppliedontheexternalVREFpin whichispin-sharedwithotherfunctions,allofthepin-sharedfunctionsexceptVREF onthispinaredisabled. Bit3 Unimplemented,readas“0” Bit2~0 ADCK2~ADCK0:SelectADCclocksource 000:fSYS 001:fSYS/2 010:fSYS/4 011:fSYS/8 100:fSYS/16 101:fSYS/32 110:fSYS/64 111:Undefined ThesethreebitsareusedtoselecttheclocksourcefortheA/Dconverter. |
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