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HT45R2K-C Datasheet(PDF) 27 Page - Holtek Semiconductor Inc |
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HT45R2K-C Datasheet(HTML) 27 Page - Holtek Semiconductor Inc |
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27 / 105 page  Rev. 1.40 �6 �a��� 1�� �01� Rev. 1.40 �7 �a��� 1�� �01� HT45R2K-C/-B/-A Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale HT45R2K-C/-B/-A Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale Oscillator Configuration Thedeviceprovidesthreesystemoscillatorcircuitsknownasacrystaloscillator(HXT),anexternal RCoscillator(ERC)andaninternalhighspeedRCoscillator(HIRC)whichareusedforthesystem clock.Therearealsoaninternal12kHzRC(LIRC)anda32.768kHzcrystaloscillator(LXT)which canprovideasourceclockfortheWDTclocknamedfS,theLCDdriverclock,namedfSUBandthe Timer/Eventcounterslowfrequencyclock,namedfL,forvarioustimingpurposes. ERC LXT LIRC High Frequency Oscillation(HOSC) Low Frequency Oscillation(LOSC) LFS fL fSYS fSYS/4 fSUB WDT Timer fs HIRC HXT Configuration Option “Halt” OSCON fSYS FSUBS LCD “Halt” FSUBC Prescaler (/3, /4, /8) LCDCK [1:0] fSYS /4 Configuration Option System Clock Configurations InthePowerdownmode,thesystemoscillator,theinternal12kHzRCoscillator(LIRC)orthe external32.768kHzcrystaloscillator(LXT)maybeenabledordisableddependinguponthe correspondingclockcontrolbitdescribedintherelevantsections.Thesystemcanbewoken-upfrom thePowerdownmodebytheoccurrenceofaninterrupt,atransitiondeterminedbyconfiguration optionsonanyofthePortApins,aWDToverfloworatimeroverflow.Theaccompanyingtable illustratestheOscillatortypelist. Type Name Freq. Pins Exte�nal C�ystal HXT 400kHz~1��Hz OSC1/OSC� Exte�nal RC ERC 400kHz~1��Hz OSC1 Inte�nal Hig� Speed RC HIRC 4� 8 o� 1��Hz — Exte�nal Low Speed C�ystal LXT 3�.768kHz XT1/XT� Inte�nal Low Speed RC LIRC 1�kHz — Oscillator Types |
Número de pieza similar - HT45R2K-C_15 |
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Descripción similar - HT45R2K-C_15 |
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