HT45F2020 datasheet(36/85 Pages) HOLTEK

36 / 85 page

Rev. 1.00

April 11, 2017

Rev. 1.00

April 11, 2017

HT45F2020/HT45F2022

Sound Effect Generator Flash MCU

HT45F2020/HT45F2022

Sound Effect Generator Flash MCU

Watchdog Time-out Reset during SLEEP or IDLE Mode

TheWatchdogtime-outResetduringSLEEPorIDLEModeisalittledifferentfromPower-onreset.

MostoftheconditionsremainunchangedexceptthattheProgramCounterandtheStackPointerwill

beclearedto“0”andtheTOflagwillbesetto“1”.RefertotheA.C.CharacteristicsfortSSTdetails.

WDT Time-out

Internal Reset

tSST

WDT Time-out Reset during SLEEP or IDLE Timing Chart

Reset Initial Conditions

Thedifferenttypesofresetdescribedaffecttheresetflagsindifferentways.Theseflags,known

asPDFandTOarelocatedinthestatusregisterandarecontrolledbyvariousmicrocontroller

operations,suchastheSLEEPorIDLEModefunctionorWatchdogTimer.Theresetflagsare

showninthetable:

PDF

Reset Conditions

Power-on reset

WDT time-out reset during Normal or SLOW Mode operation

WDT time-out reset during IDLE or SLEEP Mode operation

Note: “u” stands for unchanged

Thefollowingtableindicatesthewayinwhichthevariouscomponentsofthemicrocontrollerare

affectedafterapower-onresetoccurs.

Item

Condition after Reset

Program Counter

Reset to zero

Interrupts

All interrupts will be disabled

WDT,Time Base

Clear after reset, WDT begins counting

Timer Module

Timer Module 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

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