HT67F488 datasheet(45/171 Pages) HOLTEK

45 / 171 page

Rev. 1.60

�ove��e� �� 016

HT67F488/HT67F489

TinyPowerTM A/D Flash MCU with LCD & EEPROM

Operating Mode Switching

Thedevicecanswitchbetweenoperatingmodesdynamicallyallowingtheusertoselectthebest

performance/powerratioforthepresenttaskinhand.Inthiswaymicrocontrolleroperationsthat

donotrequirehighperformancecanbeexecutedusingslowerclocksthusrequiringlessoperating

currentandprolongingbatterylifeinportableapplications.

Insimpleterms,ModeSwitchingbetweentheNORMALModeandSLOWModeisexecuted

usingtheHLCLKbitandCKS2~CKS0bitsintheSMODregisterwhileModeSwitchingfromthe

NORMAL/SLOWModestotheSLEEP/IDLEModesisexecutedviatheHALTinstruction.When

aHALTinstructionisexecuted,whetherthedeviceenterstheIDLEModeortheSLEEPModeis

determinedbytheconditionoftheIDLENbitintheSMODregisterandFSYSONintheCTRL

WhentheHLCLKbitswitchestoalowlevel,whichimpliesthatclocksourceisswitchedfromthe

highspeedclocksource,fH,totheclocksource,fH/2~fH/64orfSUB.IftheclockisfromthefSUB,the

highspeedclocksourcewillstoprunningtoconservepower.Whenthishappensitmustbenoted

thatthefH/16andfH/64internalclocksourceswillalsostoprunning,whichmayaffecttheoperation

ofotherinternalfunctionssuchastheTMs.Theaccompanyingflowchartshowswhathappenswhen

thedevicemovesbetweenthevariousoperatingmodes.

SL E EP0

HA LT i ns tr uc ti on is e xe cu te d

f SYS of f

CP U st op

ID LE N= 0

f TB C of f

f SU B of f

WD T & L VD o ff

NO RM AL

f SYS =f H ~f H /6 4

f H o n

CP U ru n

f SYS o n

f TB C o n

f SU B o n

ID LE 1

HA LT i ns tr uc ti on is e xe cu te d

CP U st op

ID LE N= 1

FS YS ON =1

f SYS o n

f TB C o n

f SU B on

ID LE 0

HA LT i ns tr uc ti on is e xe cu te d

CP U st op

ID LE N= 1

FS YS ON =0

f SYS o ff

f TB C o n

f SU B o n

SL OW

f SYS =f SU B

CP U ru n

f SYS o n

f TB C o n

f SU B o n

f H o ff

SL E EP1

HA LT i ns tr uc ti on is e xe cu te d

f SYS o ff

CP U st op

ID LE N= 0

f TB C o ff

f SU B o n

WD T or L VD o n

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