at89s51-33sc ATMEL Corporation, at89s51-33sc Datasheet - Page 24
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at89s51-33sc
Manufacturer Part Number
at89s51-33sc
Description
At89s51, 8-bit Microcontroller With 4k Bytes In-system Programmable Flash
Manufacturer
ATMEL Corporation
Datasheet
1.AT89S51-33SC.pdf
(32 pages)
- Current page: 24 of 32
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25. External Program Memory Read Cycle
26. External Data Memory Read Cycle
24
AT89S51
PORT 0
PORT 2
PORT 0
PORT 2
PSEN
PSEN
ALE
ALE
RD
A0 - A7 FROM RI OR DPL
t
LHLL
t
AVLL
t
AVLL
t
P2.0 - P2.7 OR A8 - A15 FROM DPH
LHLL
t
AVWL
t
LLAX
A0 - A7
t
AVDV
t
LLAX
t
LLWL
t
t
LLPL
RLAZ
t
t
AVIV
LLDV
A8 - A15
t
PLAZ
t
RLRH
t
RLDV
DATA IN
t
t
PLIV
LLIV
INSTR IN
t
PXIX
t
PXIZ
t
t
t
RHDZ
t
A0 - A7 FROM PCL
PLPH
PXAV
t
RHDX
WHLH
A8 - A15 FROM PCH
A8 - A15
A0 - A7
INSTR IN
2487C–MICRO–03/05
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