AT89C51-20QC View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'AT89C51-20QC' PDF : 17 Pages View PDF
AT89C51
External Program Memory Read Cycle
ALE
PSEN
PORT 0
PORT 2
tLHLL
tAVLL
tLLPL
tLLAX
A0 - A7
tPLAZ
tLLIV
tPLIV
tPXIZ
tPXIX
INSTR IN
tPLPH
tPXAV
tAVIV
A8 - A15
A0 - A7
A8 - A15
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
4-39
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