HT45F4N datasheet(49/170 Pages) HOLTEK

49 / 170 page

Rev. 1.30

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HT45F4N/HT45FH4N

Power Bank Flash MCU

HT45F4N/HT45FH4N

Power Bank Flash MCU

Entering the SLEEP Mode

ThereisonlyonewayforthedevicetoentertheSLEEPModeandthatistoexecutethe“HALT”

instructionintheapplicationprogramwiththeIDLENbitinSMODregisterequalto“0”andthe

WDTorLVDon.Whenthisinstructionisexecutedundertheconditionsdescribedabove,the

followingwilloccur:

• ThesystemclockandTimeBaseclockwillbestoppedandtheapplicationprogramwillstopat

the“HALT”instruction,buttheWDTorLVDwillremainwiththeclocksourcecomingfromthe

fLclock.

• TheDataMemorycontentsandregisterswillmaintaintheirpresentcondition.

• TheWDTwillbeclearedandresumecounting

• TheI/Oportswillmaintaintheirpresentconditions.

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

willbecleared.

Entering the IDLE0 Mode

ThereisonlyonewayforthedevicetoentertheIDLE0Modeandthatistoexecutethe“HALT”

instructionintheapplicationprogramwiththeIDLENbitinSMODregisterequalto“1”andthe

FSYSONbitinCTRLregisterequalto“0”.Whenthisinstructionisexecutedundertheconditions

describedabove,thefollowingwilloccur:

• Thesystemclockwillbestoppedandtheapplicationprogramwillstopatthe“HALT”instruc-

tion,buttheTimeBaseclockfTBCandthelowfrequencyfLclockwillbeon.

• TheDataMemorycontentsandregisterswillmaintaintheirpresentcondition.

• TheWDTwillbeclearedandresumecounting.

• TheI/Oportswillmaintaintheirpresentconditions.

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

willbecleared.

Entering the IDLE1 Mode

ThereisonlyonewayforthedevicetoentertheIDLE1Modeandthatistoexecutethe“HALT”

instructionintheapplicationprogramwiththeIDLENbitinSMODregisterequalto“1”andthe

FSYSONbitinCTRLregisterequalto“1”.Whenthisinstructionisexecutedundertheconditions

describedabove,thefollowingwilloccur:

• ThesystemclockandTimeBaseclockandfTBCandthelowfrequencyfLwillbeonandtheappli-

cationprogramwillstopatthe“HALT”instruction.

• TheDataMemorycontentsandregisterswillmaintaintheirpresentcondition.

• TheWDTwillbeclearedandresumecounting.

• TheI/Oportswillmaintaintheirpresentconditions.

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

willbecleared.

HT45F4N Datasheet(PDF) 49 Page - Holtek Semiconductor Inc

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