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參數(shù)資料
| 型號(hào)： | 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)： | 5/9頁 |
| 文件大?。?/td> | 458K |
| 代理商： | EDE702 |
Copyright
1998 E-Lab Digital Engineering, Inc. All Rights Reserved.
Page 5
The following section outlines the use and function of the EDE702 LCD controller. While this
datasheet explains many of the specific LCD module features, your particular module may be
slightly different. When in doubt, always refer to the datasheet for your particular LCD module. In
addition, note that some one-line LCD modules do not have the entire row mapped contiguously in
memory; you must move the cursor position to the start of the LCD memory's "second line" in
order to write to the second half of the locations on these one-line displays.
USING THE EDE702 SERIAL LCD CONTROLLER
The EDE702 can be written to in much the same way as a terminal display device. It accepts
standard ACSII characters and writes them to the display screen. In addition, the EDE702 will
interpret several ASCII control commands and perform specific functions as directed by them. This
section details the use of the various commands available on the EDE702.
Upon powerup, your host controller (the device writing to the EDE702) should be programmed to
wait approximately 50 mS for the LCD to initialize. Following this, the display is ready to accept
data for display. Before the first character is written, the EDE702 will home the cursor (the cursor
will be invisible). Therefore, the first character written to the EDE702 will be displayed in the
upper-left hand corner of a two row display, or in the left-most position of a one-row display.
Subsequent character writes to the EDE702 will cause the cursor location to increment by one for
each character written.
Most ASCII characters can be displayed on the LCD module using the EDE702 (see your LCD
module datasheet for a complete listing). However, the EDE702 will intercept certain ASCII control
characters and not display them on the screen, instead performing a specific command upon the
LCD module. The following table shows the ASCII codes that will be intercepted by the EDE702:
Value ASCII Command
$0D
Carriage Return
$0A
Line Feed
$0C
Form Feed
$08
Backspace
Function Performed
Ignore this character and print nothing.
Ignore this character and print nothing.
Clear screen, home cursor.
Perform destructive backspace (move cursor back one position and
erase character in that position).
Read next command and perform desired function (see Table Two).
$FE
EDE702 Control
Table One: ASCII Control Characters
Sending the Form Feed character to the EDE702 causes it to clear the screen and home the cursor.
The Backspace command causes the cursor to be moved back by one space (on a given row),
deleting the character that was in that position (commonly called a "destructive backspace").
Notice that the last command, $FE, has special meaning to the EDE702. It is used to issue direct
commands to the LCD module. The following table shows the direct commands that can be sent
after sending the value $FE (1111 1110 binary, 254 decimal) to the EDE702:
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