LCD Help - 4 x 20 Wiring and Sample Code

Megaplow

Hello,
I have two LCD modules one is a AMC2004A and the other has the same wiring diagram.

1 VSS 0V Ground
2 VDD 5.0V Supply Voltage for logic
3 V0 (Variable) Operating voltage for LCD
4 RS H/L H: DATA, L: Instruction code
5 R/W H/L H: Read(MPU→Module) L: Write(MPU→Module)
6 E H,H→L Chip enable signal
7 DB0 H/L Data bit 0
8 DB1 H/L Data bit 1
9 DB2 H/L Data bit 2
10 DB3 H/L Data bit 3
11 DB4 H/L Data bit 4
12 DB5 H/L Data bit 5
13 DB6 H/L Data bit 6
14 DB7 H/L Data bit 7
15 LED(+) Anode of LED Backlight
16 LED(-) Cathode of LED Backlight

Do these LCDs need to be wired up to all those data pins?
Can I use a propeller for this?
Can you point me to a sample project using this?

Thanks in advance,
Joe

Leon

You can use those displays in 4-bit mode, saving some pins. Updating will be slower than 8-bit mode, of course. You can save another pin by connecting the R/W pin so that the display is write-only.

Leon

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Amateur radio callsign: G1HSM
Suzuki SV1000S motorcycle

Chris Savage

Example schematics and code can be found at the following link. I hope this helps. Take care.

http://www.parallax.com/Store/Accessories/Displays/tabid/159/CategoryID/34/List/0/Level/a/ProductID/49/Default.aspx?SortField=ProductName%2cProductName

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Chris Savage
Parallax Engineering