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參數資料
| 型號： | W742C813 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4-BIT, MROM, 3.58 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 20 MM, 2.75 MM HEIGHT, QFP-100 |
| 文件頁數： | 12/56頁 |
| 文件大小： | 455K |
| 代理商： | W742C813 |
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W742E/C813
- 12 -
5.4 Data Memory (RAM)
5.4.1 Architecture
The static data memory (RAM) used to store data is arranged up to 5120(5K)
×
4 bits. The data RAM
is divided into 40 banks; each bank has 128
×
4 bits. Executing the
MOV DBKRL,WR, MOV
DBKRH,WR
or
MOV DBKRL,#I, MOV DBKRH,#I
instructions can determine which data bank is used.
The data memory can be accessed directly or indirectly and the data bank register has to be confirmed
firstly. In the indirect addressing mode, each data bank will be divided into eight pages. The RAM page
register has to be setting when in the indirect accessing RAM. The instructions
MOV WRn,@WRq
MOV @WRq,WRn
could Read or Write the whole memory in the indirect addressing mode. The RAM
address of @WRq indicates to (DBKRH)*800H + (DBKRL)*80H + (RAM page)*10H + (WRq). The
organization of the data memory is shown in Figure 5-2.
data bank 00
5120
address
0000H
:
007FH
0080H
:
00FFH
4 bits
5120 * 4 bits
data bank 01
:
:
:
1380H
:
13FFH
data bank 39
(or Working Registers bank)
00H
:
0FH
10H
:
1FH
20H
:
2FH
70H
:
7FH
:
:
1(or 1st WR page)
2nd data RAM page
(or 2nd WR page)
8th data RAM page
(or 8th WR page)
3rd data RAM page
(or 3rd WR page)
(or Working Registers bank)
Figure 5-2 Data Memory Organization
The 1st and 2nd data bank (00H to 7FH & 80H to 0FFH) in the data memory can also be used as the
working registers (WR). It is also divided into sixteen pages. Each page contains 16 working registers.
When one page is used as Working Register, the others can be used as the normal data memory. The
WR page register can be switched by executing the MOV WRP,R or MOV WRP,#I instructions. The
data memory can not do the logical operation directly with the immediate data, it has to via the Working
Register.
5.4.2 RAM Page Register (PAGE)
The page register is organized as a 4-bit binary register. The bit descriptions are as follows:
R/W
R/W
R/W
0
1
2
3
PAGE
Note: R/W means read/write available.
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| W742E813 | 4-BIT MICROCONTROLLER |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| W742C814 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4 BIT MICROCONTROLLER |
| W742C816 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| W742C818 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| W742C81A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT MICROCONTROLLER |
| W742CE811 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT MICROCONTROLLER |
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