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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F4M 데이터시트(PDF) 86 Page - Holtek Semiconductor Inc |
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HT45F4M 데이터시트(HTML) 86 Page - Holtek Semiconductor Inc |
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86 / 138 page  Rev. 1.10 86 �an�a�� 1�� �01� Rev. 1.10 87 �an�a�� 1�� �01� HT45F4M Lithium Battery Backup Power ASSP MCU HT45F4M Lithium Battery Backup Power ASSP 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 ACS4� ACS�~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) D� D� D1 D0 — — — — ADRL(ADRFS=1) D7 D6 D� D4 D� D� D1 D0 ADRH(ADRFS=0) D11 D10 D9 D8 D7 D6 D� D4 ADRH(ADRFS=1) — — — — D11 D10 D9 D8 ADCR0 START EOCB ADOFF ADRFS ACS� ACS� ACS1 ACS0 ADCR1 ACS4 VBGEN — VREFS — ADCK� ADCK1 ADCK0 ACERL ACE7 ACE6 ACE� ACE4 ACE� ACE� ACE1 ACE0 A/D Converter Register List |
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