- 您現在的位置：買賣IC網 > PDF目錄363894 > W742C81A (WINBOND ELECTRONICS CORP) 4-BIT MICROCONTROLLER PDF資料下載
參數資料
| 型號： | W742C81A |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT MICROCONTROLLER |
| 中文描述： | 4-BIT, FLASH, MICROCONTROLLER, UUC100 |
| 封裝： | DIE-100 |
| 文件頁數： | 9/45頁 |
| 文件大小： | 567K |
| 代理商： | W742C81A |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁當前第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁
Preliminary W742E81A/W742C81A
Publication Release Date: April 2000
Revision A1
- 9 -
6.4 Data Memory (RAM)
6.4.1 Architecture
The static data memory (RAM) used to store data is arranged as 2048
×
4 bits. The data RAM is
divided into sixteen banks; each bank has 128
×
4 bits. Executing the MOV DBKR,WR or MOV
DBKR,#I instruction can determine which data bank is used. The data memory can be addressed
directly or indirectly. But the data bank must be confirmed firstly; and the page in the data bank will
be done in the indirect addressing mode, too. In indirect addressing mode, each data bank will be
divided into eight pages. Before the data memory is addressed indirectly, the page which the data
memory is in must be confirmed. The organization of the data memory is shown in Figure 6-2.
1st data bank
(or Working Registers bank)
2048
addresses
000H
:
07FH
080H
:
0FFH
4 bits
2048 * 4 bits
2nd data bank
(or Working Registers bank)
:
:
780H
:
7FFH
16th data bank
00H
:
0FH
10H
:
1FH
20H
:
2FH
70H
:
7FH
:
:
1st data RAM page
(or 1st WR page)
2nd data RAM page
(or 2nd WR page)
8(or 8th WR page)
3(or 3rd WR page)
3rd data bank
Figure 6-2 Data Memory Organization
The 1st and 2nd data bank (00H to 7FH & 80H to FFH) 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 WR, the others can be used as the normal data memory. The WR page
can be switched by executing the MOV WRP,R or MOV WRP,#I instruction. The data memory cannot
operate directly with immediate data, but the WR can do. The relationship between data memory
locations and the page register (PAGE) in indirect addressing mode is described in the next sub-
section.
6.4.2 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.
Bit 3 is reserved.
Bit 2, Bit 1, Bit 0 Indirect addressing mode preselect bits:
000 = Page 0 (00H - 0FH)
相關PDF資料 |
PDF描述 |
|---|---|
| W742S819 | 4-BIT TELEPHONE CONTROLLER |
| W742S81A | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| W742S82A | 4-BIT TELEPHONE CONTROLLER |
| W74IE20X | 4-BIT FLASH MICROCONTROLLER |
| W741E202 | 4-BIT FLASH MICROCONTROLLER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W742CE811 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT MICROCONTROLLER |
| W742E | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4 BIT MICROCONTROLLER |
| W742E/C811 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4 BIT MICROCONTROLLER |
| W742E811 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| W742E813 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT MICROCONTROLLER |
發布緊急采購，3分鐘左右您將得到回復。