Rainbow-electronics DS89C450 Manual de usuario Pagina 35

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DS89C430/DS89C440/DS89C450 Ultra-High-Speed Flash Microcontrollers
35 of 48
Figure 12. Page Mode 1, External Data Memory Access
(PAGES = 01, STRETCH = 1, CD = 10)
ALE
P
SEN
Port 0
Port 2
ALE
Port 0
Port 2
R
D/
W
R
ALE
P
SE
N
Port 0
Port 2
LSB Addr LSB Addr LSB Addr LSB Addr LSB AddrLSB Addr LSB Addr
LSB AddrLSB AddrLSB Addr LSB Addr
LSB Addr
LSB AddrLSB Addr LSB Addr
LSB AddrLSB AddrLSB AddrLSB Addr LSB AddrLSB Addr
InstInst InstInst Inst
InstInst Inst InstInst
InstInst Inst Inst
Inst
Data
DataMOVX
MOVX
MOVX
MSB Addr
MSB Addr
MSB Addr
Data
Memory Access (Stretch =1)
Memory Access (Stretch =1)
Memory Access (Stretch =1)
MOVX Instruction
MOVX Instruction
MOVX Instruction
MOVX Inst
Fetch
MOVX Inst
Fetch
XTAL1
P
SEN
R
D/
WR
R
D/
WR
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