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HT45R4U датащи(PDF) 75 Page - Holtek Semiconductor Inc

номер детали HT45R4U
подробное описание детали  TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45R4U датащи(HTML) 75 Page - Holtek Semiconductor Inc

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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


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