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HT66F20 Datasheet(PDF) 172 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 172 Page - Holtek Semiconductor Inc |
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172 / 298 page  Rev. 1.90 17� �e���a�� 18� �01� Rev. 1.90 17� �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 ADCR0 Register • HT66F20/HT66F30/HT66F40/HT66F50 Bit 7 6 5 4 3 2 1 0 Name START EOCB ADO�� ADR�S — ACS� ACS1 ACS0 R/W R/W R R/W R/W — R/W R/W R/W POR 0 1 1 0 — 0 0 0 Bit7 START:StarttheA/Dconversion 0→1→0:start 0→1:ResettheA/DconverterandsetEOCBto“1” ThisbitisusedtoinitiateanA/Dconversionprocess.Thebitisnormallylowbutifset highandthenclearedlowagain,theA/Dconverterwillinitiateaconversionprocess. WhenthebitissethightheA/Dconverterwillbereset. Bit6 EOCB:EndofA/Dconversionflag 0:A/Dconversionended 1:A/Dconversioninprogress ThisreadonlyflagisusedtoindicatewhenanA/Dconversionprocesshascompleted. Whentheconversionprocessisrunningthebitwillbehigh. Bit5 ADOFF:ADCmodulepoweron/offcontrolbit 0:ADCmodulepoweron 1:ADCmodulepoweroff ThisbitcontrolsthepowertotheA/Dinternalfunction.Thisbitshouldbecleared tozerotoenabletheA/Dconverter.IfthebitissethighthentheA/Dconverterwill beswitchedoffreducingthedevicepowerconsumption.AstheA/Dconverterwill consumealimitedamountofpower,evenwhennotexecutingaconversion,thismay beanimportantconsiderationinpowersensitivebatterypoweredapplications. Note:1.itisrecommendedtosetADOFF=1beforeenteringIDLE/SLEEPModefor savingpower. 2.ADOFF=1willpowerdowntheADCmodule. Bit4 ADRFS:ADCDataFormatControl 0:ADCDataMSBisADRHbit7,LSBisADRLbit4 1:ADCDataMSBisADRHbit3,LSBisADRLbit0 Thisbitcontrolstheformatofthe12-bitconvertedA/DvalueinthetwoA/Ddata registers.DetailsareprovidedintheA/Ddataregistersection. Bit3 Unimplemented,readas“0” Bit2~0 ACS2, ACS1, ACS0:SelectA/Dchannel(whenACS4is"0") 000:AN0 001:AN1 010:AN2 011:AN3 100:AN4 101:AN5 110:AN6 111:AN7 ThesearetheA/Dchannelselectcontrolbits.Asthereisonlyoneinternalhardware A/DconvertereachoftheeightA/Dinputsmustberoutedtotheinternalconverter usingthesebits.IfbitACS4intheADCR1registerissethighthentheinternal1.25V willberoutedtotheA/DConverter. |
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