HT45F5Q-2 datasheet(37/117 Pages) HOLTEK

37 / 117 page

Rev. 1.00

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Rev. 1.00

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HT45F5Q-2

Charger Flash MCU

HT45F5Q-2

Charger Flash MCU

SLOW Mode to FAST Mode Switching

InSLOWmodethesystemclockisderivedfromfSUB.Whensystemclockisswitchedbacktothe

FASTmodefromfSUB,theCKS2~CKS0bitsshouldbesetto"000"~"110"andthenthesystemclock

willrespectivelybeswitchedtofH~fH/64.

However,iffHisnotusedinSLOWmodeandthusswitchedoff,itwilltakesometimetore-

oscillateandstabilisewhenswitchingtotheFASTmodefromtheSLOWMode.Thisismonitored

usingtheHIRCFbitintheHIRCCregister.Thetimedurationrequiredforthehighspeedsystem

oscillatorstabilizationisspecifiedintheSystemStartUpTimeCharacteristics.

FAST Mode

SLOW Mode

CKS�~CKS0 = 000~110

SLEEP Mode

FHIDEN=0� FSIDEN=0

HALT instr�ction is exec�ted

IDLE0 Mode

FHIDEN=0� FSIDEN=1

HALT instr�ction is exec�ted

IDLE1 Mode

FHIDEN=1� FSIDEN=1

HALT instr�ction is exec�ted

IDLE2 Mode

FHIDEN=1� FSIDEN=0

HALT instr�ction is exec�ted

Entering the SLEEP Mode

ThereisonlyonewayforthedevicetoentertheSLEEPModeandthatistoexecutethe"HALT"

instructionintheapplicationprogramwithboththeFHIDENandFSIDENbitsintheSCCregister

equalto"0".InthismodealltheclocksandfunctionswillbeswitchedoffexcepttheWDTfunction.

Whenthisinstructionisexecutedundertheconditionsdescribedabove,thefollowingwilloccur:

• Thesystemclockwillbestoppedandtheapplicationprogramwillstopatthe"HALT"instruction.

• TheDataMemorycontentsandregisterswillmaintaintheirpresentcondition.

• TheI/Oportswillmaintaintheirpresentconditions.

• Inthestatusregister,thePowerDownflag,PDF,willbesetandtheWatchdogtime-outflag,TO,

willbecleared.

• TheWDTwillbeclearedandresumecountingiftheWDTfunctionisenabled.IftheWDTfunction

isdisabled,theWDTwillbeclearedandthenstopped.

HT45F5Q-2 Datasheet(PDF) 37 Page - Holtek Semiconductor Inc

HT45F5Q-2 Datasheet(HTML) 37 Page - Holtek Semiconductor Inc

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