HT45F4N datasheet(47/170 Pages) HOLTEK

47 / 170 page

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HT45F4N/HT45FH4N

Power Bank Flash MCU

HT45F4N/HT45FH4N

Power Bank Flash MCU

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/64orfL.IftheclockisfromthefL,thehigh

speedclocksourcewillstoprunningtoconservepower.Whenthishappensitmustbenotedthatthe

fH/16andfH/64internalclocksourceswillalsostoprunning,whichmayaffecttheoperationofother

internalfunctionssuchastheTMs.Theaccompanyingflowchartshowswhathappenswhenthe

devicemovesbetweenthevariousoperatingmodes.

NORMAL Mode to SLOW Mode Switching

WhenrunningintheNORMALMode,whichusesthehighspeedsystemoscillator,andtherefore

consumesmorepower,thesystemclockcanswitchtorunintheSLOWModebysettingthe

HLCLKbitto“0”andsettingtheCKS2~CKS0bitsto“000”or“001”intheSMODregister.This

willthenusethelowspeedsystemoscillatorwhichwillconsumelesspower.Usersmaydecideto

dothisforcertainoperationswhichdonotrequirehighperformanceandcansubsequentlyreduce

powerconsumption.

TheSLOWModeissourcedfromtheLIRCoscillatorandthereforerequiresthisoscillatortobe

stablebeforefullmodeswitchingoccurs.ThisismonitoredusingtheLTObitintheSMODregister.

SL OW M ode

SL E EP M ode

ID LE 0 M ode

ID LE 1 M ode

NO RM AL M od e

CK S2 ~ C KS0 = 00x B &

HL CL K = 0

WD T or L VD i s o n

ID LE N = 0

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

ID LE N = 1, F SYS ON =0

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

ID LE N = 1, F SYSO N= 1

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

HT45F4N Datasheet(PDF) 47 Page - Holtek Semiconductor Inc

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