Hi Ricardo,

The LCDs with Hitachi chips need 6 pins minimum without extra parts.

4 - data 4,5,6,7
1 - Register select
1 - Chip Select

Tie Read/Write to ground. Leave data 0,1,2,3 unconnected,
+5 to Vcc
Ground to ground
Ground to Vdisplay

You can share the data pins and the register select pin. Use it for a
keyboard etc.

-Bob