Hello friends! In this project, we will build an interrupt-based digital clock with an 8051 microcontroller and display the time on a character LCD. A hardware timer will provide the timing events, while the main program handles the display. We will start with the timer calculation, then build the seconds, minutes and hours counters. We will also correct two problems that commonly appear in beginner clocks: using the wrong timer reload and reading shared time counters while an interrupt is changing them. The original circuit images and downloadable project remain attached. The revised example assumes a classic twelve-clock 8051 running at 12 MHz. It starts at 00:00:00 after initialization and demonstrates elapsed-time counting; it does not retain the time when power is removed. Figure: Int ...