Rainbow Electronics AT89S52 - Manual (Page 25)

AT89S52
25
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