 | Author | Message | | | eric | | Posted: Thu Oct 05, 2006 11:31 pm Post subject: One-chip LCD interface | | | | Site Admin Joined: 01 Jan 1970 Posts: 311 | Source: E-Lab Digital Engineering Inc.
The EDE702 Serial LCD Interface IC has been designed to
provide a cost-effective LCD control solution for a wide variety
of embedded designs. The chip, a firmware-programmed
PIC16C54A, allows nearly any text-based LCD module to
be controlled via a simple one-wire data link, freeing an additional
6 to 10 I/O lines on your microcontroller or microprocessor
system.
Besides full LCD control, the EDE702 also allows the
creation of custom characters. Another useful feature is
the serial-controlled digital output pin for lighting an
indicator LED, driving a sounder, etc.
With a 2400 or 9600 baud rate and selectable serial data
polarity, the EDE702 can easily communicate with any
device capable of sending asynchronous serial data
(including the BASIC Stamp!). Connection to a PC’s
serial port (RS232) requires only one 33-kΩ resistor.
The application diagram shows how the EDE702 may
be employed as the ‘glue’ between a PC and an LCD
(based on the HD44780 controller). A 4-MHz resonator
is used to clock the EDE702. If an external
(TTL) oscillator is used, its output should be connected
to only OSC1 (pin 16), while OSC2 (pin 15) is left
unconnected. The LCD contrast is set in the usual way
with a 10-20 kΩ preset. The schematic may be easily
tested with the aid of a small QBASIC program as
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