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參數資料
| 型號： | W742S81A |
| 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, FLASH, 3.58 MHz, MICROCONTROLLER, PQFP100 |
| 文件頁數： | 8/47頁 |
| 文件大小： | 242K |
| 代理商： | W742S81A |
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W742S81A
- 8 -
111 = ROM page 7 (3800H - 3FFFH)
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
2048
addresses
000H
:
07FH
080H
:
0FFH
4 bits
2048 * 4 bits
2nd data bank
:
:
780H
:
7FFH
16th data bank
(or Working Registers bank)
00H
:
0FH
:
1FH
:
2FH
70H
7 :
:
:
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)
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:
3
Note: R/W means read/write available.
Bit 3 is reserved.
Bit 2, Bit 1, Bit 0 Indirect addressing mode preselect bits:
R/W
R/W
R/W
0
1
2
PAGE
相關PDF資料 |
PDF描述 |
|---|---|
| W742S82A | 4-BIT TELEPHONE CONTROLLER |
| W74IE20X | 4-BIT FLASH MICROCONTROLLER |
| W741E202 | 4-BIT FLASH MICROCONTROLLER |
| W741E203 | 4-BIT FLASH MICROCONTROLLER |
| W741E204 | 4-BIT FLASH MICROCONTROLLER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W742S82A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT TELEPHONE CONTROLLER |
| W7-48D12 | 制造商:INTRONICS 制造商全稱:INTRONICS 功能描述:DC/DC MODULES |
| W7-48D15 | 制造商:INTRONICS 制造商全稱:INTRONICS 功能描述:DC/DC MODULES |
| W7-48D5 | 制造商:INTRONICS 制造商全稱:INTRONICS 功能描述:DC/DC MODULES |
| W7-48S12 | 制造商:INTRONICS 制造商全稱:INTRONICS 功能描述:DC/DC MODULES |
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