Rainbow Electronics DS89C450 - Manual (Page 35)

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
PSEN
Port 0
Port 2
ALE
Port 0
Port 2
RD/WR
ALE
PSEN
Port 0
Port 2 LSB Addr LSB Addr LSB Addr LSB Addr LSB Addr LSB Addr LSB Addr
LSB Addr LSB Addr LSB Addr LSB Addr
LSB Addr
LSB Addr LSB Addr LSB Addr
LSB Addr LSB Addr LSB Addr LSB Addr LSB Addr LSB Addr
Inst Inst Inst Inst Inst
Inst Inst Inst Inst Inst
Inst Inst Inst Inst Inst
Data
Data MOVX
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
PSEN
RD/WR
RD/WR