Hello friends! In this tutorial, we will use timer interrupts in an 8051 microcontroller to generate a regular output without placing a delay in the main loop. We will start with Timer 0, calculate its reload value and observe the resulting signal in Proteus. We will then repeat the example with Timer 1 and discuss how to turn a short hardware interval into a slower application task. The calculations below assume a classic twelve-clock 8051 timer and a 12 MHz oscillator. Check those assumptions whenever you select a different 8051-compatible device. The original simulations and screenshots remain attached. One detail in the earlier example needs correction: loading 5 into an eight-bit timer produces 251 counts before overflow, not 250. The revised code uses 6 for a nominal 250-microsecond ...