HT45F56 datasheet(45/90 Pages) HOLTEK

45 / 90 page

Rev. 1.11

April 11, 2017

Rev. 1.11

April 11, 2017

HT45F56

Shock Detector Flash MCU

HT45F56

Shock Detector Flash MCU

Reset Initial Conditions

Thedifferenttypesofresetdescribedaffecttheresetflagsindifferentways.Theseflags,known

asPDFandTOarelocatedinthestatusregisterandarecontrolledbyvariousmicrocontroller

operations,suchastheSLEEPorIDLEModefunctionorWatchdogTimer.Theresetflagsare

showninthetable:

PDF

Reset Function

Power-on reset

RES LVR reset during NORMAL or SLOW Mode operation

WDT time-out reset during NORMAL or SLOW Mode operation

WDT time-out reset during IDLE or SLEEP Mode operation

“u” stands for unchanged

Thefollowingtableindicatesthewayinwhichthevariouscomponentsofthemicrocontrollerare

affectedafterapower-onresetoccurs.

Item

Reset Function

Program Counter

Reset to zero

Interrupts

All interrupts will be disabled

WDT, Time Base

Clear after reset, WDT begins counting

Timer Modules

Timer Modules will be turned off

Input/Output Ports

I/O ports will be setup as inputs

Stack pointer

Stack pointer will point to the top of the stack

Thedifferentkindsofresetsallaffecttheinternalregistersofthemicrocontrollerindifferentways.

Toensurereliablecontinuationofnormalprogramexecutionafteraresetoccurs,itisimportantto

knowwhatconditionthemicrocontrollerisinafteraparticularresetoccurs.Thefollowingtable

describeshoweachtypeofresetaffectsthemicrocontrollerinternalregisters.

HT45F56 Datasheet(PDF) 45 Page - Holtek Semiconductor Inc