HT85F2270 datasheet(25/226 Pages) HOLTEK

25 / 226 page

Rev. 1.00

�� of ��6

�a� 1�� 01�

Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

9 A.C. Characteristics

Ta=��°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max. Unit

VDD

Conditions

fSYS1

S�stem clock (Cr�stal OSC)

�.�V~�.�V

PLL Disable

0.4

—

�Hz

�.7V~�.�V

0.4

—

1�

4.�V~�.�V

0.4

—

�4

fSYS�

S�stem clock (PLL)

4.�V~�.�V Cr�stal OSC=4�Hz� PLL Enable

—

��

�Hz

fLIRC

��kHz Internal RC oscillator

�V

Ta=��°C

-10%

��

+10%

kHz

�.�V~�.�V Ta=-40°C~8�°C

-�0%

��

+60%

fHIRC

�.6864�Hz Internal RC oscillator

�V

Ta=��°C

-�% �.6864 +�%

�Hz

�V

Ta=��°C

-�% �.6864 +�%

fTI�ER

Timer Input Frequenc� (T0~T�)

�.�V~�.�V fSYS=8�Hz

—

�

�Hz

�.7V~�.�V fSYS=1��Hz

—

�

4.�V~�.�V fSYS=�4�Hz

—

tRES

External Reset �inimum Low Pulse width

—

�.�

�

μs

t�CD

�issing Clock Detector Timeout

—

Time from last s�stem clock to

reset initiation

100

��0

�00

μs

tSST

S�stem start-up timer period (Power-up or

wake-up from Power-Down mode when

the main oscillator is off or s�stem clock is

switching between HXT and HIRC)

—

fSYS=HXT or HIRC

—

10�4

—

tSYS

tRSTD

S�stem Reset Dela� Time (LVR reset)

—

��

tSRESET

Software Reset Width to Reset

—

4�

1�0

μs

tHTO

HIRC Turn On Period

�.�V~�.�V HIRC OFF → ON

—

�00

—

μs

tINT

External Interrupt �inimum Pulse Width

—

�CU is in Normal mode or Idle

mode

—

tSYS

tLVR

Low Voltage Width to Reset

—

1�0

�40

480

μs

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