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HT67F5652 bảng dữ liệu(PDF) 134 Page - Holtek Semiconductor Inc |
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HT67F5652 bảng dữ liệu(HTML) 134 Page - Holtek Semiconductor Inc |
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134 / 224 page  Rev. 1.00 134 De�e��e� 0�� �01� Rev. 1.00 135 De�e��e� 0�� �01� HT67F5652 24-Bit Delta Sigma A/D + LCD Flash MCU HT67F5652 24-Bit Delta Sigma A/D + LCD Flash MCU Comparators Twoindependentanalogcomparatorsarecontainedwithinthedevice.Thesefunctionsoffer flexibilityviaitsregistercontrolledfeaturessuchaspower-down,polarityselect,hysteresisetc. InsharingitspinswithnormalI/OpinsthecomparatordoesnotwastepreciousI/Opinsifthere functionsareotherwiseunused. CnP CnPOL CnOUT To Inte��upt CnSEL CnOUT Pin CnN - + CnO Comparator (n=0 or 1) Comparator Operation Thedevicecontainstwocomparatorfunctionswhichareusedtocomparetwoanalogvoltagesand provideanoutputbasedontheirdifference.Fullcontrolovertheinternalcomparatorsisprovidedvia twocontrolregisters,CP0CandCP1C,oneassignedtoeachcomparator.Thecomparatoroutputis recordedviaabitintheirrespectivecontrolregister,butcanalsobetransferredoutontoasharedI/Opin. Additionalcomparatorfunctionsinclude,outputpolarity,hysteresisfunctionsandpowerdowncontrol. Anypull-highresistorsconnectedtothesharedcomparatorinputpinswillbeautomatically disconnectedwhenthecomparatorisenabled.Asthecomparatorinputsapproachtheirswitching level,somespuriousoutputsignalsmaybegeneratedonthecomparatoroutputduetotheslow risingorfallingnatureoftheinputsignals.Thiscanbeminimisedbyselectingthehysteresis functionwillapplyasmallamountofpositivefeedbacktothecomparator.Ideallythecomparator shouldswitchatthepointwherethepositiveandnegativeinputssignalsareatthesamevoltage level;however,unavoidableinputoffsetsintroducesomeuncertaintieshere.Thehysteresisfunction, ifenabled,alsoincreasestheswitchingoffsetvalue. Comparator Register Therearetworegistersforoverallcomparatoroperation,oneforeachcomparator.Ascorresponding bitsinthetworegistershaveidenticalfunctions,theyfollowingregistertableappliestobothregisters. Register Name Bit 7 6 5 4 3 2 1 0 CP0C C0SEL C0EN C0POL C0OUT C0OS — — C0HYEN CP1C C1SEL C1EN C1POL C1OUT C1OS — — C1HYEN Comparator Registers List • CP0C Register Bit 7 6 5 4 3 2 1 0 Na�e C0SEL C0EN C0POL C0OUT C0OS — — C0HYEN R/W R/W R/W R/W R R/W — — R/W POR 1 0 0 0 0 — — 1 Bit7 C0SEL:SelectComparatorpinsorI/Opins 0:I/Opinselect 1:Comparatorpinselect ThisistheComparatorpinorI/Opinselectbit.Ifthebitishighthecomparatorwill beselectedandthetwocomparatorinputpinswillbeenabled.Asaresult,thesetwo pinswilllosetheirI/Opinfunctions.Anypull-highconfigurationoptionsassociated withthecomparatorsharedpinswillalsobeautomaticallydisconnected. |
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