HD44780 Controller LCD/VFD
1 VSS 0V Ground
2 VDD 5.0V Supply Voltage for logic
3 VO (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(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
151 A LED +
161 K LED -
These are very commomly used LCD/VFDs controllers for wiring directly to the parallel port of a computer as there are a myriad of software applications to display information from a PC.