參數(shù)資料
型號： DS89C450
英文描述： Ultra-High-Speed Flash Microcontrollers
中文描述： 超高速閃存微控制器
文件頁數(shù)： 29/48頁
文件大小： 934K
代理商： DS89C450
DS89C430/DS89C440/DS89C450 Ultra-High-Speed Flash Microcontrollers
29 of 48
The following diagrams illustrate the timing relationship for external data memory access in full speed (stretch value
= 0), in the default stretch setting (stretch value = 1), and slow data memory accessing (stretch value = 4), when
the system clock is in divide-by-1 mode (CD1:CD0 = 10b).
Figure 8. Nonpage Mode, External Data Memory Access (Stretch = 0, CD1:CD2 = 10)
MOVX Instruction
ALE
Port 0
XTAL1
PSEN
RD/WR
MOVX
INST
A
DATA
A
A
A
A
Port 2
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)
MOVX Instruction
ALE
Port 0
XTAL1
PSEN
RD/WR
MOVX
INST
A
DATA
A
A
A
A
Port 2
1st Machine Cycle
2nd Machine Cycle
MOVX
Instruction
Fetch
Memory Access
Stretch = 1
3rd Machine Cycle
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