HT45F56 datasheet(35/90 Pages) HOLTEK

35 / 90 page

Rev. 1.11

April 11, 2017

Rev. 1.11

April 11, 2017

HT45F56

Shock Detector Flash MCU

HT45F56

Shock Detector Flash MCU

SLOW Mode to NORMAL Mode Switching

InSLOWmodethesystemclockisderivedfromfSUB.ToswitchbacktotheNORMALMode,

wherethehighspeedsystemoscillatorisused,theHLCLKbitshouldbesetto“1”orHLCLKbitis

“0”buttheCKS2~CKS0fieldissetto“01x”or“1xx”.Asacertainamountoftimewillberequired

forthehighfrequencyclocktostablise,thestatusoftheHTObitischecked.

NORMAL Mode

SLOW Mode

or HLCLK=1

SLEEP0 Mode

IDLEN=0, WDT off

HALT instruction is executed

SLEEP1 Mode

IDLE0 Mode

IDLE1 Mode

CKS2~CKS0 ≠ 00x as HLCLK=0

IDLEN=0, WDT on

HALT instruction is executed

IDLEN=1, FSYSON=0

HALT instruction is executed

IDLEN=1, FSYSON=1

HALT instruction is executed

Entering the SLEEP0 Mode

ThereisonlyonewayforthedevicetoentertheSLEEP0Modeandthatistoexecutethe“HALT”

instructionintheapplicationprogramwiththeIDLENbitintheSMODregisterequalto“0”andthe

WDTisoff.Whenthisinstructionisexecutedundertheconditionsdescribedabove,thefollowing

willoccur:

• Thesystemclock,WDTclockandTimeBaseclockwillbestoppedandtheapplicationprogram

willstopatthe"HALT"instruction.

• TheDataMemorycontentsandregisterswillmaintaintheirpresentcondition.

• TheI/Oportswillmaintaintheirpresentconditions.

• Inthestatusregister,thePowerDownflagPDFwillbeset,andWDTtimeoutflagTOwillbe

cleared.

• TheWDTwillbeclearedandstoppedastheWDTisdisabled.

HT45F56 Datasheet(PDF) 35 Page - Holtek Semiconductor Inc