Here's a first version of a library for LCD displays based on the Mitsubishi 50530 chip.https://github.com/sponnet/LCD50530/
We have tested it on an Optrex DMC-50652N display , but it should also work on a Seiko/IIS C456002A
We'll add cleaner wiring diagram later, but the data pins should be at :
digital 0 -> DB7 (databit 7)
digital 1 -> DB6 (databit 6)
digital 2 -> DB5 (databit 5)
digital 3 -> DB4 (databit 4)
digital 4 -> EX (Execute)
digital 5 -> R/W (Read/Write)
digital 6 -> I/OC1 (IO Control 1)
digital 7 -> I/OC2 (IO Control 2)
5V -> VSS (GND)
Gnd -> Vdd (logic power)
VLCD (LCD power) should get a voltage of 12v in our tests , or the LCD display shows no characters ( in our test ), so you need an external power source for that...
Remarks are welcome !
Created by Jeroen van Beirendonck & Stefaan Ponnet - inspired on the work of these guys : http://www.weethet.nl/dutch/basicstamp2_optrexdmc50652n_lcd.php