8051 Timing Counting Calculator

Clock cycle Megahertz (mhz)
Desired timer run time (DRT) Milliseconds (mSec)
Timing TaskStandard 12 Time CycleEnhanced 6 Clock CycleTime
Single Timer
1 / (mhz/12)
1 / (mhz/6)		 uSec
8-bit Timing Counter
TIC12 * 256 / 1000
TIC6 * 256 / 1000		 mSec
16-bit timer counter
TIC12 * 65536 / 1000
TIC6 * 65536 / 1000		 mSec
8-bit recount value
256 - (DRT / TIC12 * 1000)
256 - (DRT / TIC6 * 1000)		 mSec
16-bit recount value
65536 - (DRT / TIC12 * 1000)
65536 - (DRT / TIC6 * 1000)		 mSec

What is an 8051 Timing & Counting Calculator?

An 8051 Timing & Counting Calculator is a tool used to determine time delays, counting intervals, and timer register values for 8051 microcontrollers. The 8051 microcontroller has built-in Timers (Timer0 & Timer1) that are used for generating precise delays, counting external events, and setting up baud rates for serial communication.

Why Use an 8051 Timing & Counting Calculator?

Manually calculating timer values for different clock frequencies can be complex. This calculator helps:

  • Microcontroller programmers configure timers quickly.
  • Embedded system developers optimize time-based tasks.
  • Students understand the 8051 timer operation without manual calculations.

It simplifies the calculation of timer values, overflow counts, and delay durations based on the selected mode (Mode 0, 1, 2, or 3).

How to Use an 8051 Timing & Counting Calculator?

  1. Select the timer (Timer 0 or Timer 1) and mode (8-bit auto-reload, 16-bit, etc.).
  2. Enter the crystal oscillator frequency (e.g., 11.0592 MHz).
  3. Choose the desired delay or counting interval.
  4. The calculator computes the timer register values (THx, TLx) and the number of overflows needed.
  5. Use these values in your 8051 timer programming.

When to Use an 8051 Timing & Counting Calculator?

  • When designing real-time systems using the 8051 microcontroller.
  • While setting precise time delays for tasks like LED blinking, motor control, etc.
  • In serial communication, where the timer is used to set the baud rate.
  • When measuring external pulse signals using the counter mode.