All instruments that was on my PC was Proteus ISIS. For first time I wrote all that I need to use in my project. There are:
1. LCD (I took LM016L model)
2. 8051 MC
3. 9 Buttons for KBD.
So let's start.
For first i need to read LCD datasheed LM016L. I see that LCD uses HD44780 controller. Oh, so let's find HD44780 datasheet It's here.
After 30 minutes I got this scheme:
