at89c52-12qi ATMEL Corporation, at89c52-12qi Datasheet - Page 19

• Manufacturer Part Number: at89c52-12qi
• Description: 8-bit Microcontroller With 8k Bytes Flash
• Manufacturer: ATMEL Corporation

External Program Memory Read Cycle
External Data Memory Read Cycle
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
P2.0 - P2.7 OR A8 - A15 FROM DPH
t
LHLL
t
AVWL
t
LLAX
t
A0 - A7
AVDV
t
LLAX
t
LLWL
t
t
RLAZ
LLPL
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
A0 - A7 FROM PCL
t
t
RHDZ
t
t
PLPH
PXAV
RHDX
WHLH
A8 - A15 FROM PCH
A8 - A15
A0 - A7
INSTR IN
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