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參數(shù)資料
| 型號： | EDE702 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Serial LCD Interface IC |
| 中文描述： | 液晶顯示器串行接口芯片 |
| 文件頁數(shù)： | 2/9頁 |
| 文件大?。?/td> | 458K |
| 代理商： | EDE702 |
Copyright
1998 E-Lab Digital Engineering, Inc. All Rights Reserved.
Page 2
PIN DEFINITIONS
LCD Connection Pins
LCD Enable Line (Pin 6): .....................................
LCD Enable line;
pin 6 on LCD screen module
LCD RS Line (Pin 7): ...........................................
LCD Register Select line;
pin 4 on LCD screen module
LCD RW Line (Pin 8):..........................................
LCD Read/Write line;
pin 5 on LCD screen module
D4 (Pin 10):........................................................
LCD Data 4 line;
pin 11 on LCD screen module
D5 (Pin 11):........................................................
LCD Data 5 line;
pin 12 on LCD screen module
D6 (Pin 12):........................................................
LCD Data 6 line;
pin 13 on LCD screen module
D7 (Pin 13):........................................................
LCD Data 7 line;
pin 14 on LCD screen module
Control & Data Pins
BAUD (Pin 1):.....................................................
Baud Rate Selection;
0 = 2400, 1 = 9600 Baud
Polarity (Pin 2):...................................................
Serial Data Polarity Control;
0 = Inverted, 1 = Standard
RCV (Pin 17):......................................................
Serial Data Input
OUT (Pin 18):.....................................................
Digital Output (Need not be connected)
Clock/ Power Pins
OSC1,OSC2 (Pin 16, Pin 15):..............................
4 MHz Resonator or Crystal Connection
+ 5V Power (Pin 14, Pin 4):.................................
Connect to + 5V DC
Ground (Pin 5):...................................................
Connect to
0 VDC (GND)
+ 5V or GND (Pin 3):..........................................
* To maintain compatibility with EDE700 pinout,
pin may be connected to either + 5V or GND
PC CONNECTION
The EDE702 can be used with most HD44780-based text LCD's. The two most common types of
connectors on these modules are the 1x14 and 2x7 pin arrangements (there may be two additional
pins if the LCD is the backlit type). The pin numbers should be identified on the LCD module.
Refer to Figure One for connection of the LCD module to the EDE702. Notice that not all of the
LCD module's pins need to be connected because the EDE702 uses a 4-bit transfer mode.
Figure One also illustrates the hookup used for connection to a PC. A RS-232 voltage-level
converter IC such as the MAX232 is not required; internal clamp diodes on the EDE702 convert the
incoming RS-232 level voltages into TTL-level signals. Also, notice that the POLARITY input on the
EDE702 is tied low; this
causes the EDE702 to interpret the inverted RS-232 signals correctly (a
voltage-converter IC such as the MAX232, inside the PC, inverts the signal for transmission).
* IMPORTANT NOTE:
The 33K
W
resistor must be used when connecting to a PC in this fashion;
omitting it will cause excessive current to flow, possibly damaging both the PC serial port and the
EDE702 IC.
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