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HT45F39 Datasheet(PDF) 61 Page - Holtek Semiconductor Inc |
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HT45F39 Datasheet(HTML) 61 Page - Holtek Semiconductor Inc |
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61 / 102 page  Rev. 1.10 60 July 01, 2016 Rev. 1.10 61 July 01, 2016 HT45F39/HT45F391 Ultrasonic Distance Measurement 8-bit Flash MCU HT45F39/HT45F391 Ultrasonic Distance Measurement 8-bit Flash MCU NotethatiftheAuto-EnvelopeProcessingUnitcontrolbit,namelySAVP,issetbythe application,theEOCBbitisinvalidandtheA/Dconversionfunctioniscontrolledby theAuto-EnvelopeProcessingUnit. Bit5 ADOFF:ADCModulepoweron/offcontrolbit 0:Poweron 1:Poweroff ThisbitcontrolsthepowertotheA/Dinternalfunction.Thisbitshouldbecleared tozerotoenabletheA/Dconverter.IfthebitissethighthentheA/Dconverterwill beswitchedoffreducingthedevicespowerconsumption.AstheA/Dconverterwill consumealimitedamountofpower,evenwhennotexecutingaconversion,thismay beanimportantconsiderationinpowersensitivebatterypoweredapplications. Note:ItisrecommendedtosetADOFF=1beforeenteringSLEEP0/SLEEP1Modefor savingpower. ADOFF=1willpowerdowntheADCmodule. Bit4 Unimplemented,readas"0" Bit3~0 ACS3~ACS0:SelectA/Dchannel(ACS4=0) 0000AN0 0001AN1 0010AN2 0011AN3 0100AN4 0101AN5 0110AN6 0111AN7 1000SCFOutput(MUXIN) 1001VCM ThesearetheA/Dchannelselectcontrolbits.Asthereisonlyoneinternalhardware A/DconvertereachoftheeightA/Dinputsmustberoutedtotheinternalconverter usingthesebits. ADCR1 Register Bit 7 6 5 4 3 2 1 0 Name ACS4 VBGEN — — — ADCK2 ADCK1 ADCK0 R/W R/W R/W — — — R/W R/W R/W POR 1 1 — — — 0 0 0 Bit7 ACS4:SelecteInternal1.04VasADCinputControl 0:Disable 1:Enable Thisbitenables1.04VtobeconnectedtotheA/Dconverter.TheVBGENbitmust firsthavebeensettoenablethebandgapcircuit1.04VvoltagetobeusedbytheA/D converter.WhentheACS4bitissethigh,thebandgap1.04Vvoltagewillberoutedto theA/DconverterandtheotherA/Dinputchannelsdisconnected. Bit6 VBGEN:Internal1.04VControl 0:Disable 1:Enable ThisbitcontrolstheinternalBandgapcircuiton/offfunctiontotheA/Dconverter. Whenthebitissethighthebandgapvoltage1.04VcanbeusedbytheA/Dconverter. If1.04VisnotusedbytheA/Dconverter,thenthebandgapreferencecircuitwillbe automaticallyswitchedofftoconservepower.When1.04Visswitchedonforuseby theA/Dconverter,atimetBGshouldbeallowedforthebandgapcircuittostabilize beforeimplementinganA/Dconversion. Bit5~3 unimplemented,readas"0" |
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