Then my command would be:
bfgminer -o Pool_URL:Port -u USERNAME -p PASSWORD --icarus-options 115200:1:1 --icarus-timing 3.0=100 --bmsc-options --bmsc-freq 0781
Not quite, those are command line options for the BITMAINtech-specific fork of cgminer. For bfgminer (if you want to run both Block Erupters and U1s and overclock) you would do:
bfgminer -o pool:port -u username -p password -S erupter:all -S antminer:all --set-device antminer:clock=x0781