Edwin

ok this is what i need.
i have 8 i/o lines and when line 1 goes down
the measurement starts. when line 2 goes down the measurements stops. this is the same for the 3 and 4 etc.

the time that is measured between start ans stop must be in ms. eg 4.23 ms

is that possible

it can by polling the lines or by an
interrupt (how get i 8 lines to 1 interrupt). i need the best way.