Frequency Counter using AT89C2051 and LCD (Assembly)

A very simple easy to make Frequency counter project. This project is powered with small AT89C2051 microcontroller with LCD. Block Diagram of circuit is shown below. It can support a wide range of frequency input starting from 1Hz to ~16.5Mhz, rest depends on pin characteristics.

Theory of Operation
As we all know frequency of a signal is number of cycles per second. I made use of this logic to calc... Read Compelte post
Posted on Tue Oct 27 2009, 09:27 PM

Frequency Counter using AT89C2051 and LCD

xx yy zz are used in X2D routine which is 4 byte hex to decimal conversion routine.

XX0,XX1,XX2,XX3 is input 4 byte number, YY0,YY1,YY2,YY3 is temporary number used inside X2D routine, and lastly ZZ0,ZZ1,ZZ2,ZZ3 is the o/p BCD number of X2D routine.

TMR0_ISR is used as interrupt service routine for 1 sec timer.
TMR1_ISR is interrupt routine for counting incoming signal frequency.
disp_num to display a... Read Compelte post
Posted by ajay_bhargav on Tue Feb 02 2010, 12:23 PM

Frequency Counter using AT89C2051 and LCD (Assembly)

Project tested and working perfectly

A very simple easy to make Frequency counter project. This project is powered with small AT89C2051 microcontroller with LCD. Block Diagram of circuit is shown below. It can support a wide range of frequency input starting from 1Hz to ~16.5Mhz, rest depends on pin characteristics.

Theory of Operation
As we all know frequency of a signal is number of cycle per second. I made use of this logic to calcu... Read Compelte post
Author: Ajay Bhargav | Date added: Tue Oct 27 2009, 09:06 PM

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ExperimenterUK
Mon Jan 07 2019, 09:01 AM
@REVOCATUS please post in the AVR forum
Mon Dec 24 2018, 02:55 PM
REVOCATUS MATEMU
sorry I mean referee boards for player substitution
Mon Dec 24 2018, 02:54 PM
REVOCATUS MATEMU
hi am.looking how to build referee by using Atmega 328 and its codes
Sat Dec 15 2018, 07:15 PM
Arslan ayoub
Hii ,, can I get the simulation of numeric keypad lock on proteus
ExperimenterUK
Mon Dec 03 2018, 10:47 PM
Please post questions in the forum. The chat box is for chat
Mon Dec 03 2018, 12:13 PM
help!me!
help! I don't understand busy flag!
Mon Dec 03 2018, 01:31 AM
ile
hello
Mon Nov 12 2018, 11:28 AM
Pavan_user
i have seen your replica of I2C programming using AT89C51 but i am unable to understand the "ack_bit" variable usage ...looks like it is always 1...can you elaborate how acknowledgment is working....
bgk3678
Tue Nov 06 2018, 08:06 PM
kindly any one give solution for my problem
ExperimenterUK
Tue Nov 06 2018, 03:18 AM
Pins high is the normal state. You need a program to set them low

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Posted By ExperimenterUK
Sat Jan 26 2019, 07:19 PM
Yes that helps a lot.At first sight I can't see th...
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Posted By Rizz
Sat Jan 26 2019, 06:43 AM
@ExperimenterUK I have updated the post with more ...
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Sat Jan 26 2019, 02:30 AM
What is your definition of a Palindrome ?The ones ...
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Posted By Rizz
Fri Jan 25 2019, 06:31 PM
I have written a code to check if a number is a pa...
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Posted By ExperimenterUK
Sun Jan 06 2019, 10:37 PM
Which 8051 chip are you using ?
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Posted By SONACHAI1234
Sun Jan 06 2019, 08:21 AM
Hi,By mistakenly i burn rx program in my 8051 micr...
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Posted By ExperimenterUK
Wed Dec 19 2018, 06:27 PM
Nobody knows?sifirsekizThe problem is that you are...
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Guys pleaseeeee :((
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Posted By sifirsekiz
Sat Dec 15 2018, 07:09 PM
HiThe pulse-sensor-amped has an analogue output.Th...