IS80C51 Datasheet, PDF (40/43 Pages) Integrated Silicon Solution, Inc – CMOS SINGLE CHIP 8-BIT MICROCONTROLLER

IS80C51
IS80C31
TIMING WAVEFORMS
ALE
PSEN
PORT 0
PORT 2
tLHLL
tLLPL
tAVLL
tPLPH
tPLIV
tLLAX
tPLAZ
tPXIX
A7-A0
tLLIV
tAVIV
A15-A8
INSTR IN
tPXIZ
A7-A0
A15-A8
Figure 29. External Program Memory Read Cycle
ISSI ^®
ALE
PSEN
RD
PORT 0
PORT 2
tLLDV
tLLWL
tWHLH
tRLRH
tAVLL
tRLAZ
tLLAX
tRLDV _tRHDX
A7-A0 FROM RI OR DPL
DATA IN
tAVWL
tAVDV
A15-A8 FROM DPH
tRHDZ
A7-A0 FROM PCL
INSTR IN
A15-A8 FROM PCH
Figure 30. External Data Memory Read Cycle
40
Integrated Silicon Solution, Inc. — 1-800-379-4774
MC003-1D
11/19/98