Rainbow-electronics AT89LS51 Manuel d'utilisateur télécharger pdf (Page 22)

22

AT89LS51

3053A–8051–05/02

External Program Memory Read Cycle

External Data Memory Read Cycle

t

LHLL

t

LLIV

t

PLIV

t

LLAX

t

PXIZ

t

PLPH

t

PLAZ

t

PXAV

t

AVLL

t

LLPL

t

AVIV

t

PXIX

ALE

PSEN

PORT 0

PORT 2

A8 - A15

A0 - A7 A0 - A7

A8 - A15

INSTR IN

t

LHLL

t

LLDV

t

LLWL

t

LLAX

t

WHLH

t

AVLL

t

RLRH

t

AVDV

t

AVWL

t

RLAZ

t

RHDX

t

RLDV

t

RHDZ

A0 - A7 FROM RI OR DPL

ALE

PSEN

RD

PORT 0

PORT 2

P2.0 - P2.7 OR A8 - A15 FROM DPH

A0 - A7 FROM PCL

A8 - A15 FROM PCH

DATA IN INSTR IN

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