How to use ICAP2 in ''one pulse mode''?

[adib]

Posted on April 02, 2004 at 11:53

How to use ICAP2 in ''one pulse mode''?

[adib]

Posted on March 23, 2004 at 16:19

Hi,

In my application I'm using Timer A in ''one pulse mode'', ICAP1 is used to generate a pulse on OCMP1.

I would like to use ICAP2 pin as a general purpose output (when I toggle this output it generates timer A interrupt).

Can anyone advise how to do this?

[jatin]

Posted on March 29, 2004 at 09:47

Input Capture 2 is not implemented in Timer A. Which device are you using?

[adib]

Posted on March 31, 2004 at 14:51

I'm using ST72F264G2.

When I configure ICAP2 pin as output I get an interrupt when toggling it.

I am out of ideas.......

[jatin]

Posted on April 01, 2004 at 08:48

This point is mentioned in the datasheet(page 59/168, Section 13.3.3)-

''The alternate inputs (ICAP1 & ICAP2) are always directly connected to the timer. So any transitions on these pins activates the input

capture function. Moreover if one of the ICAPi pins is configured

as an input and the second one as an output, an interrupt can be generated if the user toggles the output pin and if the ICIE bit is set.

This can be avoided if the input capture function i is disabled by reading the ICiHR.''

''After reading the ICiHR register, transfer of input capture data is inhibited and ICFi will never be set until the ICiLR register is also

read.''

I hope, this would help!

[ This message was edited by: Jatin on 01-04-2004 12:20 ]

[adib]

Posted on April 02, 2004 at 11:53

Thanks very much it solved my the problem!