Lpc2000

On other microcontrollers I've used, it was possible to start a single 
timer on a rising edge, and capture-and-reset on a falling edge (to 
capture the pulse time).

It doesn't look like this method is available on the (for example) 
LPC2131. What would be a good mechanism for these microcontrollers? 
Start two timers, feed the PWM to two pins, have one capture-and-reset 
on rising edge, the other on the falling edge? (the difference between 
the two capture registers would be the pulse time) or is there a 
better way?

Thanks,
-Pete.