Content originally posted in LPCWare by MikeSimmonds on Fri Jan 23 04:07:03 MST 2015
Because the built in host controller hardware can have up to two ports.
Whether or not each possible port actually is a host port is controlled
by the setting of the PORTSEL register (Table 315 in latest UM10470)
Presumably, if a particular port is not set as host, no status change or interrupt
bits for that port will be set.
Mike.