Time diference in microseconds

[mister_e]

try with this

' measure time that RA.1 stays high
TMR1L=0
TMR1H=0

     ' test if the signal is already high
     '
Signal1HIGH:
if signal1 then Signal1HIGH

     ' wait for the rising edge
     '
while signal1 = 0
wend

     ' signal is now high... let's count the "hi" time 
     '
T1CON.0 = 1 ' start Timer1

While signal1 ' wait for falling edge
wend

T1CON = 0 ' stopTimer

     ' store the result
     '
signal1time.lowbyte = TMR1L
Signal1time.highbyte = TMR1H