AT89S51 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'AT89S51' PDF : 32 Pages View PDF
25. External Program Memory Read Cycle
ALE
PSEN
PORT 0
PORT 2
tLHLL
tAVLL
tLLPL
tLLAX
A0 - A7
tPLAZ
tLLIV
tPLPH
tPLIV
tPXIZ
tPXIX
tPXAV
INSTR IN
tAVIV
A8 - A15
A0 - A7
A8 - A15
26. External Data Memory Read Cycle
ALE
tLHLL
PSEN
RD
PORT 0
PORT 2
tAVLL
tLLDV
tLLWL
tLLAX
tRLAZ
tRLRH
tRLDV
A0 - A7 FROM RI OR DPL
DATA IN
tAVWL
tAVDV
P2.0 - P2.7 OR A8 - A15 FROM DPH
tWHLH
tRHDZ
tRHDX
A0 - A7 FROM PCL
INSTR IN
A8 - A15 FROM PCH
24 AT89S51
2487D–MICRO–6/08
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