HT45F3820 datasheet(39/121 Pages) HOLTEK

39 / 121 page

Rev. 1.11

April 11, 2017

Rev. 1.11

April 11, 2017

HT45F3820

Ultrasonic Atomizer Flash MCU

HT45F3820

Ultrasonic Atomizer Flash MCU

SLOW Mode to NORMAL Mode Switching

InSLOWModethesystemusesLIRClowspeedsystemoscillator.ToswitchbacktotheNORMAL

Mode,wherethehighspeedsystemoscillatorisused,theHLCLKbitshouldbesetto"1"or

HLCLKbitis"0",butCKS2~CKS0issetto"010","011","100","101","110"or"111".Asacertain

amountoftimewillberequiredforthehighfrequencyclocktostabilise,thestatusoftheHTObit

ischecked.Theamountoftimerequiredforhighspeedsystemoscillatorstabilizationdependsupon

whichhighspeedsystemoscillatortypeisused.

NORMAL Mode

SLOW Mode

CKS2~CKS0 ≠ 000B or 001B

as HLCLK = 0 or HLCLK = 1

SLEEP0 Mode

IDLEN=0

HALT instruction is executed

SLEEP1 Mode

IDLE0 Mode

IDLE1 Mode

WDT and LVD are all off

IDLEN=0

HALT instruction is executed

WDT or LVD is on

IDLEN=1, FSYSON=0

HALT instruction is executed

IDLEN=1, FSYSON=1

HALT instruction is executed

Entering the SLEEP0 Mode

ThereisonlyonewayforthedevicetoentertheSLEEP0Modeandthatistoexecutethe"HALT"

instructionintheapplicationprogramwiththeIDLENbitinSMODregisterequalto"0"andthe

WDTandLVDarebothoff.Whenthisinstructionisexecutedundertheconditionsdescribedabove,

thefollowingwilloccur:

• ThesystemclockandthefSUBclockwillbestoppedandtheapplicationprogramwillstopatthe

"HALT"instruction.

• TheDataMemorycontentsandregisterswillmaintaintheirpresentcondition.

• TheWDTwillbeclearedandstopped.

• TheI/Oportswillmaintaintheirpresentconditions.

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

willbecleared.

HT45F3820 Datasheet(PDF) 39 Page - Holtek Semiconductor Inc

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