Datasheet

DS89C430/DS89C450 Ultra-High-Speed Flash Microcontrollers
28 of 46
Figure 8. Nonpage Mode, External Data Memory Access (Stretch = 0, CD1:CD2 = 10)
ALE
Port 0
XTAL1
P
SE
N
R
D/W
R
MOVX INSTA DATAA A
AA
Port 2
MOVX Instruction
1st Machine Cycle
2nd Machine Cycle
MOVX
Instruction
Fetch
Memory
Access
Stretch = 0
Figure 9. Nonpage Mode, External Data Memory Access (Stretch = 1, CD1:CD2 = 10)
ALE
Port 0
XTAL1
P
SE
N
R
D/W
R
MOVX INSTA DATAA A
AA
Port 2
MOVX Instruction
1st Machine Cycle 2nd Machine Cycle
MOVX
Instruction
Fetch
Memory Access
Stretch = 1
3rd Machine Cycle