參數(shù)資料
型號: μPD789217Y
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
中文描述: 8位單片機(jī)微控制器(8位單片微控制器)
文件頁數(shù): 17/144頁
文件大?。?/td> 632K
代理商: ΜPD789217Y
Preliminary Product Information
17
μ
PD789216Y, 789217Y
4.2
Data Memory Addressing
Each of the
μ
PD789216Y and
μ
PD789217Y is provided with a wide range of addressing modes to make memory
manipulation as efficient as possible. A data memory area (FD00H to FFFFH) can be accessed using a unique
addressing mode according to its use, such as a special function register (SFR). Figure 4-2 illustrates the data
memory addressing modes.
Figure 4-2. Data Memory Addressing Modes
Special function register (SFR)
256
×
8 bits
Internal high-speed RAM
512
×
8 bits
EEPROM
128
×
8 bits
Internal ROM
Note
Direct addressing
Register indirect addressing
Based addressing
SFR addressing
Short direct addressing
Unusable
Unusable
F F F F H
F F 2 0 H
F F 1 F H
F F 0 0 H
F E F F H
F E 2 0 H
F E 1 F H
F D 0 0 H
F C F F H
F 8 8 0 H
F 8 7 F H
F 8 0 0 H
F 7 F F H
n n n n H
0 0 0 0 H
n n n n H + 1
Note
The size of internal ROM varies depending on the model (see the following table).
Product name
Last address of internal ROM
nnnnH
μ
PD789216Y
3FFFH
μ
PD789217Y
5FFFH
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