Looking for Assembly source code for 8051 events counter

[shafee001]

event counting with 8051

hi all,
can any one post a assemply source code for 805a events counter program,
thanks

Added after 1 minutes:

sorry ,,,
i mean 8051
thanks again

 

[asahin11]

Re: 8051 events counter

Hi shafee001,

Try this site, maybe you can find something

http://www.8052.com/

regrads,

 

[guttinasrinivas]

Re: 8051 events counter

There is some fizz around this event counter. You cannot use this event counter for counting events faster than 1/12th of clock for the microcontroller. I suggest using some external counter & read the value from it periodically. Connect the external interrupt to the carry of the external counter.

Let me look at my back up, somewhere I have some old project I did for frequency measurement. If I find it, I'll upload complete project with source code, schematics too.

Srinu

 

[mosavi]

Re: 8051 events counter

Hi
You can use external interrupt ability of 8051 and write a simple code in interupt
service routin to count the event.

 

[shafee001]

8051 events counter

i just want to count the standard AC power frequency from generator, to encure that frequency is 50 HZ and to stop D.G. in case of overspeed, ...

 

[mosavi]

8051 events counter

Hi
Tell me what language yoy use in your applications
C, ASM ,BASIC ...;
therefor u most change 50hz AC to square wave
( by a simple Transistor SW ) and connect it to EX0 or EX1 sources of 8051.
you must enable external intrrupt and set mode to
edge trigger .
better Idea is use of captuer mod of timer2 in 8052.

 

[shafee001]

8051 events counter

hello mosavi ,,,
can you send me the source code of both cases ,,,
thanks

 

[mosavi]

8051 events counter

you must be wait.
I write it as soon as.
regrads

 

[eng_ahmed22]

8051 events counter

i have only an idea,
u can use a timer as external clock, and load it with a prescaller. when it overflow, it will rise an interrupt flag
then u can handel it in the interrupt servise routin