參數(shù)資料
型號: μPD789415
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): 18/126頁
文件大小: 590K
代理商: ΜPD789415
18
μ
PD789415, 789416, 789417
4.2
Data Memory Addressing
Each of the
μ
PD789415,
μ
PD789416, and
μ
PD789417 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
Built-in high-speed RAM
512
×
8 bits
RAM space for LCD data
28
×
8 bits
Built-in 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
FA 1 C H
FA 1 B H
FA 0 0 H
F 9 F F H
n n n n H
0 0 0 0 H
n n n n H + 1
Note
The size of built-in ROM varies depending on the model. (See the following table.)
Product name
Last address of built-in ROM
nnnnH
μ
PD789415
2FFFH
μ
PD789416
3FFFH
μ
PD789417
5FFFH
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