Async Fuel Flag

[J Ludwig]

ref 138.adx - I was watching the "async fuel" flag (offset 1C, bitmask 10) and it appeared to show "yes" when the fuel was cut off during downhill at cruise speed when the throttle position went to zero and the base pulse width went to zero. Does this flag only indicate when fuel is cut off or is there another purpose? I'm curious why the async pulse width value doesn't return to zero when returning to steady state power.