A complex application system of liquid crystal display based on single chip computer control is designed which can display current temperature value and can draw the real temperature curve on LCD. The system hardware is constituted by single chip computer AT89C51
parallel A/D converter AD1674
I/O extended port 8255
character liquid crystal displayer LM016L and graphical liquid crystal displayer AMPIRE12864. The system circuit schematic diagram and program are designed in software Proteus and Keil respectively. Meanwhile
the system hardware is interactively simulated with system software in Proteus. Finally
the system function and every technical index are performed through actual circuit welding and debugging.