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HT66F20 Datasheet(PDF) 174 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 174 Page - Holtek Semiconductor Inc |
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174 / 298 page  Rev. 1.90 174 �e���a�� 18� �01� Rev. 1.90 175 �e���a�� 18� �01� 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 ADCR1 Register Bit 7 6 5 4 3 2 1 0 Name ACS4 V1�5EN — VRE�S — 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:SelecteInternal1.25VasADCinputControl 0:Disable 1:Enable Thisbitenables1.25VtobeconnectedtotheA/Dconverter.TheV125ENbitmust firsthavebeensettoenablethebandgapcircuit1.25VvoltagetobeusedbytheA/D converter.WhentheACS4bitissethigh,thebandgap1.25Vvoltagewillberoutedto theA/DconverterandtheotherA/Dinputchannelsdisconnected. Bit6 V125EN:Internal1.25VControl 0:Disable 1:Enable ThisbitcontrolstheinternalBandgapcircuiton/offfunctiontotheA/Dconverter. Whenthebitissethighthebandgapvoltage1.25VcanbeusedbytheA/Dconverter. If1.25VisnotusedbytheA/DconverterandtheLVR/LVDfunctionisdisabledthen thebandgapreferencecircuitwillbeautomaticallyswitchedofftoconservepower. When1.25VisswitchedonforusebytheA/Dconverter,atimetBGshouldbeallowed forthebandgapcircuittostabilisebeforeimplementinganA/Dconversion. Bit5 Unimplemented,readas“0” Bit4 VREFS:SelecteADCreferencevoltage 0:InternalADCpower 1:VREFpin ThisbitisusedtoselectthereferencevoltagefortheA/Dconverter.Ifthebitishigh, thentheA/DconverterreferencevoltageissuppliedontheexternalVREFpin.Ifthepin islow,thentheinternalreferenceisusedwhichistakenfromthepowersupplypinVDD. Bit3 Unimplemented,readas“0” Bit2~0 ADCK2, ADCK1, 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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