HT45F5R datasheet(44/138 Pages) HOLTEK

44 / 138 page

Rev. 1.10

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Rev. 1.10

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HT45F5R

Charger ASSP Flash MCU

HT45F5R

Charger ASSP Flash MCU

SLOW Mode to NORMAL Mode Switching

InSLOWmodethesystemclockisderivedfromfSUB.Whensystemclockisswitchedbacktothe

NORMALmodefromfSUB,theCKS2~CKS0bitsshouldbesetto"000"~"110"andthenthesystem

clockwillrespectivelybeswitchedtofH~fH/64.

However,iffHisnotusedinSLOWmodeandthusswitchedoff,itwilltakesometimetore-

oscillateandstabilisewhenswitchingtotheNORMALmodefromtheSLOWMode.Thisis

monitoredusingtheHIRCFbitintheHIRCCregister.Thetimedurationrequiredforthehighspeed

systemoscillatorstabilizationisspecifiedintheA.C.characteristics.

NORMAL Mode

SLOW Mode

CKS�~CKS0 = 000~110

SLEEP Mode

FHIDEN=0� FSIDEN=0

HALT inst�u�tion is exe�uted

IDLE0 Mode

FHIDEN=0� FSIDEN=1

HALT inst�u�tion is exe�uted

IDLE1 Mode

FHIDEN=1� FSIDEN=1

HALT inst�u�tion is exe�uted

IDLE2 Mode

FHIDEN=1� FSIDEN=0

HALT inst�u�tion is exe�uted

Entering the SLEEP Mode

ThereisonlyonewayforthedevicetoentertheSLEEPModeandthatistoexecutethe"HALT"

instructionintheapplicationprogramwiththeFHIDENandFSIDENbitinSCCregisterequal

to"0".Whenthisinstructionisexecutedundertheconditionsdescribedabove,thefollowingwill

occur:

• Thesystemclockwillbestoppedandtheapplicationprogramwillstopatthe"HALT"

instruction.

• TheDataMemorycontentsandregisterswillmaintaintheirpresentcondition.

• TheI/Oportswillmaintaintheirpresentconditions.

• Inthestatusregister,thePowerDownflagPDFwillbeset,andWDTtimeoutflagTOwillbe

cleared.

• TheWDTwillbeclearedandresumecountingastheWDTisenabled.IftheWDTisdisabled

thenWDTwillbeclearedandstopped.

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