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HT66F019 Datasheet(PDF) 44 Page - Holtek Semiconductor Inc

Part # HT66F019
Description  A/D Flash MCU with EEPROM
PDF  175 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT66F019 Datasheet(HTML) 44 Page - Holtek Semiconductor Inc

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Rev. 1.00
44
De�e��e� 01� �01�
Rev. 1.00
45
De�e��e� 01� �01�
HT66F019
A/D Flash MCU with EEPROM
HT66F019
A/D Flash MCU with EEPROM
Operating Mode Switching
Thedevicecanswitchbetweenoperatingmodesdynamicallyallowingtheusertoselectthebest
performance/powerratioforthepresenttaskinhand.Inthiswaymicrocontrolleroperationsthat
donotrequirehighperformancecanbeexecutedusingslowerclocksthusrequiringlessoperating
currentandprolongingbatterylifeinportableapplications.
Insimpleterms,ModeSwitchingbetweentheFASTModeandSLOWModeisexecutedusingthe
HLCLKbitandCKS2~CKS0bitsintheSMODregisterwhileModeSwitchingfromtheFAST/
SLOWModestotheSLEEP/IDLEModesisexecutedviatheHALTinstruction.WhenaHALT
instructionisexecuted,whetherthedeviceenterstheIDLEModeortheSLEEPModeisdetermined
bytheconditionoftheIDLENbitintheSMODregisterandtheFSYSONbitintheCTRLregister.
WhentheHLCLKbitswitchestoalowlevel,whichimpliesthatclocksourceisswitchedfromthe
highspeedclock,fH,totheclocksource,fH/2~fH/64orfSUB.IftheclockisfromthefSUB,thehigh
speedclocksourcewillstoprunningtoconservepower.Whenthishappens,itmustbenotedthat
thefH/16andfH/64internalclocksourceswillalsostoprunning,whichmayaffecttheoperationof
otherinternalfunctionssuchastheTMs.Theaccompamyingchartshowswhathappenswhenthe
devicemovesbetweenthevariousoperatingmodes.
FAST
fSYS=fH~fH/64
fH on
CPU �un
fSYS on
fTBC on
fSUB on
SLOW
fSYS=fSUB
fSUB on
CPU �un
fSYS on
fTBC on
fH off
IDLE0
HALT inst�u�tion exe�uted
CPU stop
IDLEN=1
FSYSON=0
fSYS off
fTBC on
fSUB on
IDLE1
HALT inst�u�tion exe�uted
CPU stop
IDLEN=1
FSYSON=1
fsys on
fTBC on
fSUB on
SLEEP1
HALT inst�u�tion exe�uted
fSYS off
CPU stop
IDLEN=0
fTBC off
fSUB on
WDT on
SLEEP0
HALT inst�u�tion exe�uted
fSYS off
CPU stop
IDLEN=0
fTBC off
fSUB off
WDT & LVD off



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