Rainbow-electronics AT89LV51 Manual do Utilizador descarregar pdf (Página 11)

AT89LV51

4-55

AC Characteristics

Under operating conditions, load capacitance for Port 0, ALE/PROG, and PSEN = 100 pF; load capacitance for all other

outputs = 80 pF.

External Program and Data Memory Characteristics

Symbol Parameter 12 MHz Oscillator Variable Oscillator Units

Min Max Min Max

1/t

CLCL

Oscillator Frequency 0 12 MHz

LHLL

ALE Pulse Width 127 2t

CLCL

-40 ns

AVLL

Address Valid to ALE Low 43 t

CLCL

-40 ns

LLAX

Address Hold After ALE Low 48 t

CLCL

-35 ns

LLIV

ALE Low to Valid Instruction In 233 4t

CLCL

-100 ns

LLPL

ALE Low to PSEN Low 43 t

CLCL

-40 ns

PLPH

PSEN Pulse Width 205 3t

CLCL

-45 ns

PLIV

PSEN Low to Valid Instruction In 145 3t

CLCL

-105 ns

PXIX

Input Instruction Hold After PSEN 00ns

PXIZ

Input Instruction Float After PSEN 59 t

CLCL

-25 ns

PXAV

PSEN to Address Valid 75 t

CLCL

-8 ns

AVIV

Address to Valid Instruction In 312 5t

CLCL

-105 ns

PLAZ

PSEN Low to Address Float 10 10 ns

RLRH

RD Pulse Width 400 6t

CLCL

-100 ns

WLWH

WR Pulse Width 400 6t

CLCL

-100 ns

RLDV

RD Low to Valid Data In 252 5t

CLCL

-165 ns

RHDX

Data Hold After RD 00ns

RHDZ

Data Float After RD 97 2t

CLCL

-70 ns

LLDV

ALE Low to Valid Data In 517 8t

CLCL

-150 ns

AVDV

Address to Valid Data In 585 9t

CLCL

-165 ns

LLWL

ALE Low to RD or WR Low 200 300 3t

CLCL

-50 3t

CLCL

+50 ns

AVWL

Address to RD or WR Low 203 4t

CLCL

-130 ns

QVWX

Data Valid to WR Transition 23 t

CLCL

-60 ns

QVWH

Data Valid to WR High 433 7t

CLCL

-150 ns

WHQX

Data Hold After WR 33 t

CLCL

-50 ns

RLAZ

RD Low to Address Float 0 0 ns

WHLH

RD or WR High to ALE High 43 123 t

CLCL

-40 t

CLCL

+40 ns

1 2 ... 6 7 8 9 10 11 12 13 14 15 16

Microcontroller 1
AT89LV51 1

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