DS89C420_02 Datasheet, PDF (51/58 Pages) Maxim Integrated Products – Ultra-High-Speed Microcontroller

Figure 12. PAGE-MODE 1 TIMING
XTAL1
ALE
PSEN
RD
WR
Port 0
tCLCL
tAVLL2
tLHLL
tLLAX3
t AVIV2
OPCODE MOVX
MOVX
tLLWL
t RLRH
tRHDX
tRLDV
DATA
tAVDV2
Port 2 ^LSB
LSB
LSB
MSB
LSB
MSB
tP L P H
tLLAX
tPXIX
tPLIV
OPCODE
LSB
MSB
DS89C420
tLLAX2
tWHLH
tQVWX
tWHQX
tAVWL2
tWLWH
DATA
LSB
MSB
Figure 13. PAGE-MODE 2 TIMING
XTAL1
ALE
PSEN
RD
WR
Port 0
Port 2
tCLCL
tAVLL
tAVLL2
tLLPL
tPLIV
tPLPH
tPXIX
tLLIV
LSB
tLLAX
tAVIV0
LSB
LSB
tPXIZ
MSB
OPCODE MOVX
MOVX
tLHLL
tAVLL3
tLLAX2
tLLAX3
tRLRH
tPLAZ
tLLDV
tRLDV
tAVWL2
tAVDV0
tRHDX
tWHLH
tAVWL0
tLLWL
tWLWH
tWHQX
LSB
LSB
LSB
t AVDV2
tRHDZ
tAVIV2
tQVWX
MSB
DATA
MSB
OPCODE MSB
DATA
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