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HT45FM2C Datasheet(PDF) 145 Page - Holtek Semiconductor Inc |
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HT45FM2C Datasheet(HTML) 145 Page - Holtek Semiconductor Inc |
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145 / 171 page  Rev. 1.10 144 �a� �0� �01� Rev. 1.10 145 �a� �0� �01� HT45FM2C Brushless DC Motor Flash Type 8-Bit MCU HT45FM2C Brushless DC Motor Flash Type 8-Bit MCU Preliminar� routine. Toreturnfromaninterruptsubroutine,eitheraRETorRETIinstructionmaybeexecuted.TheRETI instructioninadditiontoexecutingareturntothemainprogramalsoautomaticallysetstheEMI bithightoallowfurtherinterrupts.TheRETinstructionhoweveronlyexecutesareturntothemain programleavingtheEMIbitinitspresentzerostateandthereforedisablingtheexecutionoffurther interrupts. Low Voltage Detector – LVD EachdevicehasaLowVoltageDetectorfunction,alsoknownasLVD.Thisenabledthedeviceto monitorthepowersupplyvoltage,VDD,andprovideawarningsignalshoulditfallbelowacertain level.Thisfunctionmaybeespeciallyusefulinbatteryapplicationswherethesupplyvoltagewill graduallyreduceasthebatteryages,asitallowsanearlywarningbatterylowsignaltobegenerated. TheLowVoltageDetectoralsohasthecapabilityofgeneratinganinterruptsignal. LVD Register TheLowVoltageDetectorfunctioniscontrolledusingasingleregisterwiththenameLVDC.Three bitsinthisregister,VLVD2~VLVD0,areusedtoselectoneofeightfixedvoltagesbelowwhich alowvoltageconditionwillbedetermined.AlowvoltageconditionisindicatedwhentheLVDO bitisset.IftheLVDObitislow,thisindicatesthattheVDDvoltageisabovethepresetlowvoltage value.TheLVDENbitisusedtocontroltheoverallon/offfunctionofthelowvoltagedetector. Settingthebithighwillenablethelowvoltagedetector.Clearingthebittozerowillswitchoffthe internallowvoltagedetectorcircuits.Asthelowvoltagedetectorwillconsumeacertainamountof power,itmaybedesirabletoswitchoffthecircuitwhennotinuse,animportantconsiderationin powersensitivebatterypoweredapplications. LVDC Register Bit 7 6 5 4 3 2 1 0 Name — — LVDO LVDEN — VLVD� VLVD1 VLVD0 R/W — — R R/W — R/W R/W R/W POR — — 0 0 — 0 0 0 Bit7~6 Unimplemented,readas"0" Bit 5 LVDO: LVDOutputFlag 0:NoLowVoltageDetect 1:LowVoltageDetect Bit 4 LVDEN: LowVoltageDetectorControl 0:Disable 1:Enable Bit3 Unimplemented,readas"0" Bit 2~0 VLVD2~VLVD0: SelectLVDVoltage 000: 3.6V 001: 3.6V 010: 3.6V 011: 3.6V 100: 3.0V 101: 3.6V 110: 3.6V 111: 3.6V |
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