pulse width measurement with at89c55wd

[ancymuhammed]

pulse width measurement

Respected Experts,
I have an issue regarding the pulses of unknown frequency.

I am equipped with the following things:
1) I have an at89c55wd based development baord.
2)I have an unknown frequency source.

My Purpose:
I want to measure the pulse width of the unknown frequency that
will be fed to at89c55wd.

My queries:

1) I dont know to which pin of at89c55wd, these unknown frequency
pulses has to be fed inorder to measure the pulse width.

2) Please let me know what logic has to be used to calculate the
pulse width after these pulses(unknown frequenc pulses) are fed to an
appropriate pin of microcontroller.

 

[karesz]

pulse width measurement

Hi,
What are the posibble puls widths pls?
From a older topic: h**p://zone.ni.com/devzone/cda/tut/p/id/2875
Here is a SW for 16F628:

K.

 

[ancymuhammed]

Re: pulse width measurement

The range of pulse width is from 1.8 ms to 18ms

 

[IanP]

Re: pulse width measurement

You have to feed this signal to INT0 and INT1 pins ..
Set INT0 to be active at the rising edge, set INT1 to be active at the falling edge ..
On INT0 start timer, on INT1 stop timer ..
It’s up to you which (16-bit)Timer you choose ..
..easy-peasy-lemon-squeezy..

Rgds,
IanP