HT67F488 datasheet(48/171 Pages) HOLTEK

48 / 171 page

Rev. 1.60

�ove��e� �� 016

HT67F488/HT67F489

TinyPowerTM A/D Flash MCU with LCD & EEPROM

Entering the SLEEP0 Mode

ThereisonlyonewayforthedevicetoentertheSLEEP0Modeandthatistoexecutethe“HALT”

instructionintheapplicationprogramwiththeIDLENbitinSMODregisterequalto“0”andthe

WDTandLVDbothoff.Whenthisinstructionisexecutedundertheconditionsdescribedabove,the

followingwilloccur:

• Thesystemclock,WDTclockandTimeBaseclockwillbestoppedandtheapplicationprogram

willstopatthe“HALT”instruction.

• TheDataMemorycontentsandregisterswillmaintaintheirpresentcondition.

• TheWDTwillbeclearedandstopped.

• TheI/Oportswillmaintaintheirpresentconditions.

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

willbecleared.

Entering the SLEEP1 Mode

ThereisonlyonewayforthedevicetoentertheSLEEP1Modeandthatistoexecutethe“HALT”

instructionintheapplicationprogramwiththeIDLENbitinSMODregisterequalto“0”andthe

WDTorLVDon.Whenthisinstructionisexecutedundertheconditionsdescribedabove,the

followingwilloccur:

• ThesystemclockandTimeBaseclockwillbestoppedandtheapplicationprogramwillstopat

the“HALT”instruction,buttheWDTorLVDwillremainwiththeclocksourcecomingfromthe

fSUBclock.

• TheDataMemorycontentsandregisterswillmaintaintheirpresentcondition.

• TheWDTwillbeclearedandresumecountingiftheWDTisenabled.

• 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”

instruction,buttheTimeBaseclockfTBCandfSUBclockwillbeon.

• TheDataMemorycontentsandregisterswillmaintaintheirpresentcondition.

• TheWDTwillbeclearedandresumecountingiftheWDTisenabled.

• TheI/Oportswillmaintaintheirpresentconditions.

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

willbecleared.

Entering the IDLE1 Mode

ThereisonlyonewayforthedevicetoentertheIDLE1Modeandthatistoexecutethe“HALT”

instructionintheapplicationprogramwiththeIDLENbitinSMODregisterequalto“1”andthe

FSYSONbitinCTRLregisterequalto“1”.Whenthisinstructionisexecutedundertheconditions

describedabove,thefollowingwilloccur:

• Thesystemclock,TimeBaseclockfTBCandfSUBclockwillbeonandtheapplicationprogram

willstopatthe“HALT”instruction.

• TheDataMemorycontentsandregisterswillmaintaintheirpresentcondition.

HT67F488 Datasheet(PDF) 48 Page - Holtek Semiconductor Inc

HT67F488 Datasheet(HTML) 48 Page - Holtek Semiconductor Inc

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