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HT66F20 Datasheet(PDF) 66 Page - Holtek Semiconductor Inc

Part # HT66F20
Description  Enhanced A/D Flash Type 8-Bit MCU with EEPROM
PDF  298 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT66F20 Datasheet(HTML) 66 Page - Holtek Semiconductor Inc

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Rev. 1.90
66
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Rev. 1.90
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HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
Enhanced A/D Flash Type 8-Bit MCU with EEPROM
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
Enhanced A/D Flash Type 8-Bit MCU with EEPROM
Entering the SLEEP0 Mode
ThereisonlyonewayforthedevicetoentertheSLEEP0Modeandthatistoexecutethe"HALT"
instructionintheapplicationprogramwiththeIDLENbitinSMODregisterequalto"0"andthe
WDTandLVDbothoff.Whenthisinstructionisexecutedundertheconditionsdescribedabove,the
followingwilloccur:
• Thesystemclock,WDTclockandTimeBaseclockwillbestoppedandtheapplicationprogram
willstopatthe"HALT"instruction.
• TheDataMemorycontentsandregisterswillmaintaintheirpresentcondition.
• TheWDTwillbeclearedandstoppednomatteriftheWDTclocksourceoriginatesfromthefSUB
clockorfromthesystemclock.
• 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.
• TheWDTwillbeclearedandresumecountingiftheWDTclocksourceisselectedtocomefrom
thefSUBclockastheWDTisenabled.
• TheI/Oportswillmaintaintheirpresentconditions.
• Inthestatusregister,thePowerDownflag,PDF,willbesetandtheWatchdogtime-outflag,TO,
willbecleared.
Entering the IDLE0 Mode
ThereisonlyonewayforthedevicetoentertheIDLE0Modeandthatistoexecutethe“HALT”
instructionintheapplicationprogramwiththeIDLENbitinSMODregisterequalto“1”andthe
FSYSONbitinWDTCregisterequalto“0”.Whenthisinstructionisexecutedundertheconditions
describedabove,thefollowingwilloccur:
• Thesystemclockwillbestoppedandtheapplicationprogramwillstopatthe“HALT”
instruction,buttheTimeBaseclockandfSUBclockwillbeon.
• TheDataMemorycontentsandregisterswillmaintaintheirpresentcondition.
• TheWDTwillbeclearedandresumecountingiftheWDTclocksourceisselectedtocomefrom
thefSUBclockandtheWDTisenabled.TheWDTwillstopifitsclocksourceoriginatesfromthe
systemclock.
• TheI/Oportswillmaintaintheirpresentconditions.
• Inthestatusregister,thePowerDownflag,PDF,willbesetandtheWatchdogtime-outflag,TO,
willbecleared.



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