HT85F2240 datasheet(21/147 Pages) HOLTEK

21 / 147 page

Rev. 1.10

�1 of 147

�� 1� �01�

A/D Flash 8051 Core Low Pin Count MCU

HT85F2230/HT85F2240

9 A.C. Characteristics

Ta=��°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

fSYS1

S�stem C�ock

(Cr�sta� OSC)

�.�V~�.�V

—

0.4

—

MHz

�.7V~�.�V

0.4

—

1�

�.�V~�.�V

0.4

—

4.�V~�.�V

0.4

—

�4

fSYS�

S�stem C�ock

(High Freq�ecn� Interna� RC

Osci��ator)

�.7V~�.�V Ta=��°C

HFSCR[1:0]=00b

-�%

1�

+�%

MHz

�.�V~�.�V Ta=��°C

HFSCR[1:0]=10b

4.�V~�.�V Ta=��°C

HFSCR[1:0]=11b

�0

fLIRC

��kHz Interna� RC Osci��ator

�V

Ta=��°C

-10%

��

+10%

kHz

�.�V~�.�V Ta= -40°C~8�°C

-�0%

��

+60%

fHIRC

1�/16/�0MHz Interna� RC

Osci��ator

�.�V~�.�V Ta=��°C

HFSCR[1:0]=00b

-�%

1�

+�%

MHz

fTIMER

Timer Inp�t Freq�enc�

(T0~T�)

�.�V~�.�V fSYS=8MHz

—

�

MHz

�.�V~�.�V fSYS=16MHz

—

4.�V~�.�V fSYS=�4MHz

—

tRES

Externa� Reset Minim�m Low

P��se width

—

�.�

�

μs

tSST

S�stem Start-�p Timer Period

(Power-�p or Wake-�p from

Power-Down Mode when the

Main Osci��ator is off or S�stem

C�ock is Switching between HXT

and HIRC)

—

fSYS =HXT or HIRC

—

10�4

—

tSYS

tRSTD

S�stem Reset De�a� Time

(LVR Reset)

—

��

tSRESET

Software Reset Width to Reset

—

4�

1�0

μs

tHTO

HIRC T�rn On Period

�.�V~�.�V HIRC OFF → ON

—

�00

—

μs

tINT

Externa� Interr�pt Minim�m P��se

Width

—

MCU is in norma� mode or

Id�e mode

—

tSYS

tLVR

Low Vo�tage Width to Reset

—

1�0

�40

480

μs

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