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參數(shù)資料
| 型號： | SED1520 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | DOT MATRIX LCD DRIVER |
| 中文描述： | 點(diǎn)陣液晶驅(qū)動(dòng) |
| 文件頁數(shù)： | 9/52頁 |
| 文件大?。?/td> | 204K |
| 代理商： | SED1520 |
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S-MOS Systems, Inc. 150 River Oaks Parkway San Jose, CA 95134 Tel: (408) 922-0200 Fax: (408) 922-0238
371-1.0
9
2.0 Block Diagrams
2.3 – 2.3.1.3
2.3
DESCRIPTION OF CIRCUIT BLOCKS
2.3.1 MPU Interface
2.3.1.1
Selection of Interface Type
The SED1520 Series uses 8 bits of bi-directional data bus (D0–D7) to transfer data. The reset pin
is capable of selecting MPU interface; setting the polarity of RES to either “H” or “L” can provide
direct interface of the SED1520 with a 68 or 80 family MPU (see Table 1 below).
With CS at high level, the SED1520 is independent from the MPU bus and stays in standby mode.
In this mode, however, the reset signal is input independently of the internal status.
Table 1
2.3.1.2
Identification of Data Bus Signals
The SED1520 uses a combination of A0, E, R/W, (RD, WR) to identify a data bus signal.
Table 2
2.3.1.3
Access to Display Data RAM and Internal Register
In order to make matching of operating frequencies between the MPU and the display data RAM
or internal register, the SED1520 performs a sort of LSI–LSI pipelining via the bus holder attached
to the internal data bus.
Consider the case where the MPU reads the content of the display data RAM. In the first data read
cycle (dummy), the data is stored on the bus holder. In the next data read cycle, the data is read
from the bus holder to the system bus.
Also, consider the case where the MPU writes data to the display data RAM. In the first data write
cycle, the data is held on the bus holder. The data is written to the display data RAM before the
next data write cycle begins.
Polarity of RES
Type
A0
E
R/W
CS
D0–D7
“L” active
68 MPU
↑
↑
↑
↑
↑
↑
↑
↑
“H” active
80 MPU
RD
WR
Common
68 MPU
80 MPU
Function
A0
R/W
RD
WR
1
1
0
1
Read display data
1
0
1
0
Write display data
0
1
0
1
Read status
0
0
1
0
Write to internal register (command)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SED1520D0A | DOT MATRIX LCD DRIVER |
| SED1521 | DOT MATRIX LCD DRIVER |
| SED1600 | CMOS 80-SEGMENT LCD DRIVER |
| SED1600D | CMOS 80-SEGMENT LCD DRIVER |
| SED1600DAA | CMOS 80-SEGMENT LCD DRIVER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SED1520D0A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DOT MATRIX LCD DRIVER |
| SED1521 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DOT MATRIX LCD DRIVER |
| SED1526 | 制造商:EPSON 制造商全稱:EPSON 功能描述:Dot Matrix LCD Controller Driver |
| SED1526F0A | 制造商:EPSON 制造商全稱:EPSON 功能描述:Dot Matrix LCD Controller Driver |
| SED1526FAA | 制造商:EPSON 制造商全稱:EPSON 功能描述:Dot Matrix LCD Controller Driver |
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