8051 Microcontroller Timers/Counters

The 8051 is a popular microcontroller known for its simplicity and wide range of applications. One of its key features is the presence of built-in timers/counters, which are essential for tasks like generating delays, measuring pulse widths, and counting external events.

Number of 16-bit Timers in 8051

A standard 8051 microcontroller comes equipped with a specific number of timers/counters that are 16 bits wide. The width of the timer/counter (16 bits in this case) determines the maximum count value it can hold before overflowing.

The 8051 microcontroller has:

• Timer 0
• Timer 1

Both Timer 0 and Timer 1 are 16-bit timers/counters. This means they consist of two 8-bit registers each (TH0 and TL0 for Timer 0, TH1 and TL1 for Timer 1). The 16-bit value is formed by combining the contents of the higher byte (TH) and lower byte (TL) registers.

Therefore, the total number of 16-bit timers/counters present in a standard 8051 microcontroller is 2.

These timers can operate in various modes (Mode 0, Mode 1, Mode 2, Mode 3) and can function either as timers (counting internal clock pulses) or as counters (counting external events via input pins).

In summary, the 8051 microcontroller has two 16-bit timers/counters: Timer 0 and Timer 1.