This is the circuit diagram of the timer on LCD using 8051.
This is a very simple circuit. You are only required to know about the LCD interfacing. I have implemented this circuit on Proteus. Data pin of LCD is connected to the port 0 and command pin of LCD is connected to the p1.0,p1.1 and p1.2.
Important concept behind this is that we have to increase a register by one after one second. As we know that LCD cannot display hex value directly. So i have stored ascii value for each decimal digit in ROM that is displayed on LCD.
