HT68F003 datasheet(48/119 Pages) HOLTEK

48 / 119 page

Rev. 1.41

April 11, 2017

Rev. 1.41

April 11, 2017

HT68F002/HT68F0025/HT68F003

Cost-Effective Flash MCU with EEPROM

HT68F002/HT68F0025/HT68F003

Cost-Effective Flash MCU with EEPROM

Bit2

LVRF:LVRfunctionresetflag

0:Notactive

1:Active

Thisbitcanbeclearto"0",butcannotbesetto"1".

Bit1

Unimplemented,readas"0"

Bit0

WRF:WDTControlregistersoftwareresetflag

Describeelsewhere

Watchdog Time-out Reset during Normal Operation

TheWatchdogtime-outResetduringnormaloperationisthesameasanLVRresetexceptthatthe

Watchdogtime-outflagTOwillbesetto"1".

t RS TD + t SST

WD T Ti me -o ut

In te r nal R es et

Note:tRSTDispower-ondelay,typicaltime=16.7ms

WDT Time-out Reset during Normal Operation Timing Chart

Watchdog Time-out Reset during SLEEP or IDLE Mode

TheWatchdogtime-outResetduringSLEEPorIDLEModeisalittledifferentfromotherkinds

ofreset.MostoftheconditionsremainunchangedexceptthattheProgramCounterandtheStack

Pointerwillbeclearedto"0"andtheTOflagwillbesetto"1".RefertotheA.C.Characteristicsfor

tSSTdetails.

t SST

WD T Ti me -o ut

In te r nal R es et

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

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

Note:"u"standsforunchanged

Thefollowingtableindicatesthewayinwhichthevariouscomponentsofthemicrocontrollerare

affectedafterapower-onresetoccurs.

Item

Condition After RESET

Program Counter

Reset to zero

Interrupts

All interrupts will be disabled

WDT

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

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