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HARDWARE OVERVIEW
3.8LCD INTERFACE
The evaluation board includes a
The display is
Signals from the 80x186 processor can be connected directly to the LCD controller inputs, regardless of VCC, because 3.3 volt and 5 volt outputs are compatible with 5 volt TTL level inputs.
The LCD display is mapped in I/O space at 400H to 440H. All command and data writes to the display are to this address. Port pin 1.4 is used to control which LCD register is accessed. P1.4 = 0 accesses the command register; P1.4 = 1 accesses the data register.
3.8.1LCD Interface Demo
The diskette provided in your kit includes a file, LCD_DEMO.ASM, that contains source code you can assemble and load onto the board (using iECM). You can execute the program for a demonstration of the basic principals of operating the LCD display module. This program prints a static message to the display. The source code is commented to serve as a tutorial and can be adapted as needed for other applications and messages. Note that although the LCD module is capable of displaying standard ASCII (characters 32 through 125) or custom characters, this demo uses only ASCII characters.
For more information regarding the operation of the display controller, please refer to the Hitachi LCD Controller/Driver LSI Data Book.
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