DS89C430_07 Datasheet, PDF (28/46 Pages) Dallas Semiconductor – Ultra-High-Speed Flash Microcontrollers

DS89C430/DS89C450 Ultra-High-Speed Flash Microcontrollers
Figure 8. Nonpage Mode, External Data Memory Access (Stretch = 0, CD1:CD2 = 10)
XTAL1
MOVX Instruction
1st Machine Cycle 2nd Machine Cycle
ALE
PSEN
RD/WR
Port 0
Port 2
A
MOVX
A
A
MOVX
Instruction
Fetch
INST
A
DATA
A
Memory
Access
Stretch = 0
Figure 9. Nonpage Mode, External Data Memory Access (Stretch = 1, CD1:CD2 = 10)
XTAL1
MOVX Instruction
1st Machine Cycle 2nd Machine Cycle 3rd Machine Cycle
ALE
PSEN
RD/WR
Port 0
Port 2
A
MOVX
A
A
MOVX
Instruction
Fetch
INST
A
DATA
A
Memory Access
Stretch = 1
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