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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT45F4MA датащи(PDF) 93 Page - Holtek Semiconductor Inc |
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HT45F4MA датащи(HTML) 93 Page - Holtek Semiconductor Inc |
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93 / 145 page  Rev. 1.20 92 De�e��e� 1�� 201� Rev. 1.20 93 De�e��e� 1�� 201� HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU Analog to Digital Converter Theneedtointerfacetorealworldanalogsignalsisacommonrequirementformanyelectronic systems.However,toproperlyprocessthesesignalsbyamicrocontroller,theymustfirstbe convertedintodigitalsignalsbyA/Dconverters.ByintegratingtheA/Dconversionelectronic circuitryintothemicrocontroller,theneedforexternalcomponentsisreducedsignificantlywiththe correspondingfollow-onbenefitsoflowercostsandreducedcomponentspacerequirements. A/D Overview Thedevicecontainsamulti-channelanalogtodigitalconverterwhichcandirectlyinterfaceto externalanalogsignals,suchasthatfromsensorsorothercontrolsignalsandconvertthesesignals directlyintoa12-bitdigitalvalue. Input Channels A/D Channel Select Bits Input Pins 8 ACS�� ACS3~ACS0 AN0~AN7 TheaccompanyingblockdiagramshowstheoverallinternalstructureoftheA/Dconverter,together withitsassociatedregisters. A/ D Co nv er te r AN 7 AN 6 AN 0 A/ D Re fe re nc e Vo lt ag e A DRL AD RH A/ D Da ta Re gi st er s VBG EN ST AR T EO CB AD O FF V SS PA 1/ VR EF A DCK 2~ A DCK 0 f SY S AC E7 ~A CE 0 AC S4 ~A CS 0 1. 25V A/ D Cl oc k V DD AD O FF Bi t VR EF S Bi t AD RF S bi t ¸ 2 N (N =0 ~6 ) AN 8 A/D Converter Structure A/D Converter Register Description OveralloperationoftheA/Dconverteriscontrolledusingfiveregisters.Areadonlyregisterpair existstostoretheADCdata12-bitvalue.Theremainingthreeregistersarecontrolregisterswhich setuptheoperatingandcontrolfunctionoftheA/Dconverter. Name Bit 7 6 5 4 3 2 1 0 ADRL(ADRFS=0) D3 D2 D1 D0 — — — — ADRL(ADRFS=1) D7 D� D5 D� D3 D2 D1 D0 ADRH(ADRFS=0) D11 D10 D9 D8 D7 D� D5 D� ADRH(ADRFS=1) — — — — D11 D10 D9 D8 ADCR0 START EOCB ADOFF ADRFS ACS3 ACS2 ACS1 ACS0 ADCR1 ACS� VBGEN — VREFS — ADCK2 ADCK1 ADCK0 ACERL ACE7 ACE� ACE5 ACE� ACE3 ACE2 ACE1 ACE0 A/D Converter Register List |
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