HT45F4M datasheet(46/138 Pages) HOLTEK

46 / 138 page

Rev. 1.10

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Rev. 1.10

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HT45F4M

Lithium Battery Backup Power ASSP MCU

HT45F4M

Lithium Battery Backup Power ASSP MCU

Reset Initial Conditions

Thedifferenttypesofresetdescribedaffecttheresetflagsindifferentways.Theseflags,known

asPDFandTOarelocatedinthestatusregisterandarecontrolledbyvariousmicrocontroller

operations,suchastheSLEEPorIDLEModefunctionorWatchdogTimer.Theresetflagsare

showninthetable:

PDF

RESET Conditions

Powe�-on �eset

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LVR �eset d��ing NORMAL o� SLOW Mode ope�ation

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WDT time-o�t �eset d��ing NORMAL o� SLOW Mode ope�ation

WDT time-o�t �eset d��ing IDLE o� SLEEP Mode ope�ation

Note:“u”standsforunchanged

Thefollowingtableindicatesthewayinwhichthevariouscomponentsofthemicrocontrollerare

affectedafterapower-onresetoccurs.

Item

Condition After RESET

P�og�am Co�nte�

Reset to ze�o

Inte��pts

All inte��pts will be disabled

WDT

Clea� afte� �eset� WDT begins co�nting

Time� Mod�les

Time� Mod�les will be t��ned off

Inp�t/O�tp�t Po�ts

I/O po�ts will be set�p as inp�ts and AN0~AN7

as A/D inp�t pins

Stack Pointe�

Stack Pointe� will point to the top of the stack

HT45F4M Datasheet(PDF) 46 Page - Holtek Semiconductor Inc