using 89C4051.

erik: here is the entire body of my isr for T1:

   freq+=1;                                                                //increment frequency counter

hope it helps.

would love to see how you demonstrate the T0 issue you were talking about.

erik: here is the entire body of my isr for T1:

   freq+=1;                                                                //increment frequency counter

hope it helps.

would love to see how you demonstrate the T0 issue you were talking about.

"would love to see how you demonstrate the T0 issue you were talking about."

hello, erik?

T0 maximum input clock rate = T1 maximum input clock rate