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HT45R4U датащи(PDF) 75 Page - Holtek Semiconductor Inc |
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HT45R4U датащи(HTML) 75 Page - Holtek Semiconductor Inc |
75 / 105 page Rev. 1.10 74 �a��� 1�� �01� Rev. 1.10 7� �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD Operating Modes and System Clocks Presentdayapplicationsrequirethattheirmicrocontrollershavehighperformancebutoftenstill demandthattheyconsumeaslittlepoweraspossible,conflictingrequirementsthatareespecially trueinbatterypoweredportableapplications.Thefastclocksrequiredforhighperformancewill bytheirnatureincreasecurrentconsumptionandofcoursevice-versa,lowerspeedclocksreduce currentconsumption.AsHoltekhasprovidedthesedeviceswithbothhighandlowspeedclock sourcesandthemeanstoswitchbetweenthemdynamically,theusercanoptimisetheoperationof theirmicrocontrollertoachievethebestperformance/powerratio. System Clocks ThedevicehasmanydifferentclocksourcesforboththeCPUandperipheralfunctionoperation. Byprovidingtheuserwithawiderangeofclockoptionsusingconfigurationoptionsandregister programming,aclocksystemcanbeconfiguredtoobtainmaximumapplicationperformance. Themainsystemclock,cancomefromeitherahighfrequency,fH,orlowfrequency,fL,source, andisselectedusingtheHLCLKbitandCKS2~CKS0bitsintheSMODregister.Thehighspeed systemclockcanbesourcedfromeithertheHXTorHIRCoscillator,selectedviaaconfiguration option.ThelowspeedsystemclocksourcecanbesourcedfrominternalclockfSUB.ThefSUBclock sourceisderivedfromtheLXToscillator.Theotherchoice,whichisadividedversionofthehigh speedsystemoscillatorhasarangeoffH/2~fH/64. ThefSUBclockisalsousedastheTimeBaseandWatchdogtimerclocksource.ThefSUBclockis usedtoprovideasubstituteclockforthemicrocontrollerjustafterawake-uphasoccurredtoenable fasterwake-uptimes. HXT EC Prescaler fH LXT HighSpeedOscillation (HOSC) LowSpeedOscillation (LOSC) fH/2 fH/16 fH/64 fH/8 fH/4 fH/32 HighSpeedOscillation ConfigurationOption CKS[2:0], HLCLK fSYS FastWake-upfromSLEEPModeor IDLEModeControl(forHXTonly) fSUB WDT LCD HIRC fSUB TimeBase fSUB ÷8 fSUB Filter ECModeFilter On/OffOption OSC1 OSC2 OSC1 XT1 XT2 System Clock Configurations |
Аналогичный номер детали - HT45R4U |
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Аналогичное описание - HT45R4U |
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