tLHLL
ALE
tLLPL
tAVLL
tPLPH
tLLIV
tPLIV
PSEN
tPXIZ
tPLAZ
tLLAX
tPXIX
INSTR IN
A0 - A7
A0 - A7
PORT 0
tAVIV
A8 - A15
A8 - A15
PORT 2
Figure 6. External Program Memory Read Timing Waveforms
ALE
tLHLL
tWHLH
tLLDV
PSEN
RD
tRLRH
tLLWL
tRLDV
tLLAX
tAVLL
tRHDZ
tRHDX
tRLAZ
A0 -A7 FROM RI OR DPL
DATA IN
A0 - A7 FROM PCL
INSTR IN
PORT 0
PORT 2
tAVWL
tAVDV
P2.0 - P2.7 OR A8 -A15 FROM DPH
A8 - A15 FROM PCH
Figure 7. External Data Memory Read Cycle Waveforms
ALE
tLHLL
tWHLH
PSEN
WR
tLLWL
tQVWX
tWLWH
tAVLL
tWHQX
tLLAX
tQVWH
INSTR IN
A0 -A7 FROM RI OR DPL
DATA OUT
A0 - A7 FROM PCL
PORT 0
PORT 2
tAVWL
P2.0 - P2.7 OR A8 -A15 FROM DPH
A8 - A15 FROM PCH
Figure 8. External Data Memory Write Cycle Waveforms
11
AEROFLEX [ AEROFLEX CIRCUIT TECHNOLOGY ]
