DS89C420 Datasheet, PDF (51/59 Pages) Dallas Semiconductor – Ultra-High-Speed Microcontroller

Figure 13. Page-Mode 1 Timing
XTAL1
ALE
PSEN
RD
WR
Port 0
tCLCL
tAVLL2
tLHLL
tLLAX3
tLLWL
tRLRH
tAVIV2
OPCODE
MOVX
MOVX
tRHDX
tRLDV
DATA
tAVDV2
Port 2 ^LSB
LSB
LSB
MSB
LSB
MSB
tPLPH
tLLAX
tPXIX
tPLIV
OPCODE
LSB
MSB
DS89C420
tLLAX2
tWHLH
tQVWX
tWHQX
tAVWL2
tWLWH
DATA
LSB
MSB
Figure 14. Page-Mode 2 Timing
XTAL1
ALE
PSEN
RD
WR
Port 0
Port 2
tCLCL
tAVLL
tAVLL2
tLLPL
tPLIV
tPLPH
tPXIX
tLLIV
tAVIV0
LSB
LSB
tLLAX
tPXIZ
MSB
OPCODE MOVX
LSB
MOVX
tLHLL
tAVLL3
tLLAX2
tLLAX3
tRLRH
tPLAZ
tLLDV
tRLDV
tAVWL2
tAVDV0
tRHDX
tWHLH
tAVWL0
tWLWH
tLLWL
tWHQX
LSB
LSB
LSB
tAVDV2
tRHDZ
tAVIV2
tQVWX
MSB
DATA
MSB
OPCODE
MSB
DATA
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