AT89C55WD-33AU ATMEL [ATMEL Corporation], AT89C55WD-33AU Datasheet - Page 28
AT89C55WD-33AU
Manufacturer Part Number
AT89C55WD-33AU
Description
8-bit Microcontroller with 20K Bytes Flash
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.AT89C55WD-33AU.pdf
(35 pages)
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29. External Program Memory Read Cycle
30. External Data Memory Read Cycle
28
AT89C55WD
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
t
A0 - A7
AVDV
t
LLAX
t
LLWL
t
t
LLPL
RLAZ
t
t
LLDV
AVIV
A8 - A15
t
PLAZ
t
RLRH
t
RLDV
DATA IN
t
t
LLIV
PLIV
INSTR IN
t
PXIX
t
PXIZ
t
t
t
A0 - A7 FROM PCL
RHDZ
t
PLPH
PXAV
t
RHDX
WHLH
A8 - A15 FROM PCH
A8 - A15
A0 - A7
INSTR IN
1921D–MICRO–6/08
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