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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT67F488 датащи(PDF) 92 Page - Holtek Semiconductor Inc |
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HT67F488 датащи(HTML) 92 Page - Holtek Semiconductor Inc |
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92 / 171 page  Rev. 1.60 9� �ove��e� ��� �016 HT67F488/HT67F489 TinyPowerTM A/D Flash MCU with LCD & EEPROM Analog to Digital Converter – ADC Theneedtointerfacetorealworldanalogsignalsisacommonrequirementformanyelectronic systems.However,toproperlyprocessthesesignalsbyamicrocontroller,theymustfirstbe convertedintodigitalsignalsbyA/Dconverters.ByintegratingtheA/Dconversionelectronic circuitryintothemicrocontroller,theneedforexternalcomponentsisreducedsignificantlywiththe correspondingfollow-onbenefitsoflowercostsandreducedcomponentspacerequirements. A/D Overview Thedevicescontainamulti-channelanalogtodigitalconverterwhichcandirectlyinterfaceto externalanalogsignals,suchasthatfromsensorsorothercontrolsignalsandconvertthesesignals directlyintoeithera12-bitdigitalvalue. Input Channels A/D Channel Select Bits Input Pins 10 ACS4� ACS3~ACS0 A�0~A�9 TheaccompanyingblockdiagramshowstheoverallinternalstructureoftheA/Dconverter,together withitsassociatedregisters. A/ D Co nv er te r PB0 /A N0 ~ PB3 /A N3 PE4 /A N4 ~ PE6 /A N6 PB4 /A N7 PE7 /A N8 PB5 /A N9 A/ D Re fe re nc e Vo lt ag e A DRL A DRH A/ D Da ta Re gi st er s VBG EN ST AR T EO CB AD OF F V SS PB 4/ VR EF A DCK 2~ AD CK 0 f SY S AC E9 ~A CE 0 AC S4 ~A CS 0 A/ D Cl oc k V DD AD OF F Bi t VR EF S Bi t A DRF S bi t ¸ 2 N (N =0 ~6 ) V BG A/D Converter Structure A/D Converter Register Description OveralloperationoftheA/Dconverteriscontrolledusingsixregisters.Areadonlyregisterpair existstostoretheADCdata12-bitvalue.Theremainingfourregistersarecontrolregisterswhich setuptheoperatingandcontrolfunctionoftheA/Dconverter. |
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