參數(shù)資料
型號: UPD70433R-12
廠商: NEC Corp.
元件分類: 16位微控制器
英文描述: V55PITM 16-BIT MICROPROCESSOR
中文描述: V55PITM 16位微處理器
文件頁數(shù): 25/166頁
文件大?。?/td> 772K
代理商: UPD70433R-12
25
μ
PD70433
Figure 3-3. Basic Memory Space
0FFF0H to 0FFFFFH is a program area used for the system boot, and PS and PC become 0FFFH and 0H, respectively,
therefore the program execution starts from 0FFFF0H.
3.5.2
Extended Memory Space
The 16M-byte extended memory space is shown in Figure 3-4.
The only accesses that can be performed on the extended memory space are data accesses.
The basic memory space is mapped onto the lowest 1M bytes (000000H to 0FFFFFH) of the extended memory space,
and can be accessed using the segment registers PS, SS, DS0 and DS1.
Data accesses can be performed in the extended memory space using the extended segment registers DS2 and DS3.
With DS2 and DS3 it is possible to use a specification as a segment override prefix instruction added to a memory
manipulation instruction.
An extended memory space physical address is specified by the segment start address indicated by the extended
segment register and the offset value from the segment start position indicated by another register or immediate data. If
the generated address indicates the lowest 1M-byte area (000000H to 0FFFFFH), the basic memory space is accessed.
Vector Area
Spaecial Function Register Area
(Internal Area)
0 0 0 0 0 0 H
0 F F F F F H
0 0 0 0 0 H
0 0 3 F F H
F F E 0 0 H
F F F E F H
1M Bytes
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