Thanks, but that wasn't my question.  I know how to set and read bits in H8S registers.  My question pertains to how the H8S/2212 implements the USB protocol.

The USB protocol has a standard control message, Set_Configuration, which is sent from the host (e.g. a PC) to a USB device (e.g. the H8S).  In that message, a "wValue" is sent, which contains the configuration number.  To be specific, wValue is 16 bits, of which the high 8 bits is zero and the low 8 bits specifies a configuration number.  Values of 1-255 are valid configuration numbers, and 0 means "not configured."

The H8S/2212 hardware manual says that the Set_Configuration message is processed automatically by the USB controller (section 14.5.8, "Processing of USB Standard Commands and Class/Vendor Commands").  The only place the Configuration value appears is in the UCVR register, where bit CNFV0 "stores the Configuration value when the Set_Configuration command is received."

CNFV0 is a single bit, yet it is being used to "store" an 8-bit Configuration value received in a USB command.  My question is, how is that 8-bit value stored?  Does CNFV0 store the least-significant bit of the Configuration value?  Does the H8S USB controller only recognize Configuration values 1 and 2?  Or possibly 0 and 1?  I'd like to be able to use two different configuration values, but I don't know which values the H8S/2212 will recognize.