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HT66F20 Datasheet(PDF) 229 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 229 Page - Holtek Semiconductor Inc |
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229 / 298 page  Rev. 1.90 ��8 �e���a�� 18� �01� Rev. 1.90 ��9 �e���a�� 18� �01� HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM Low Voltage Detector – LVD EachdevicehasaLowVoltageDetectorfunction,alsoknownasLVD.Thisenabledthedeviceto monitorthepowersupplyvoltage,VDD,andprovideawarningsignalshoulditfallbelowacertain level.Thisfunctionmaybeespeciallyusefulinbatteryapplicationswherethesupplyvoltagewill graduallyreduceasthebatteryages,asitallowsanearlywarningbatterylowsignaltobegenerated. TheLowVoltageDetectoralsohasthecapabilityofgeneratinganinterruptsignal. LVD Register TheLowVoltageDetectorfunctioniscontrolledusingasingleregisterwiththenameLVDC.Three bitsinthisregister,VLVD2~VLVD0,areusedtoselectoneofeightfixedvoltagesbelowwhicha lowvoltageconditionwillbedetemined.AlowvoltageconditionisindicatedwhentheLVDObitis set.IftheLVDObitislow,thisindicatesthattheVDDvoltageisabovethepresetlowvoltagevalue. TheLVDENbitisusedtocontroltheoverallon/offfunctionofthelowvoltagedetector.Settingthe bithighwillenablethelowvoltagedetector.Clearingthebittozerowillswitchofftheinternallow voltagedetectorcircuits.Asthelowvoltagedetectorwillconsumeacertainamountofpower,itmay bedesirabletoswitchoffthecircuitwhennotinuse,animportantconsiderationinpowersensitive batterypoweredapplications. 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” Bit5 LVDO:LVDOutputFlag 0:NoLowVoltageDetected 1:LowVoltageDetected Bit4 LVDEN:LowVoltageDetectorControl 0:Disable 1:Enable Bit3 Unimplemented,readas“0” Bit2~0 VLVD2~VLVD0:SelectLVDVoltage 000:2.0V 001:2.2V 010:2.4V 011:2.7V 100:3.0V 101:3.3V 110:3.6V 111:4.4V |
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