是否可以在C ++ 11中指定枚举的位宽？

I'm exchanging packets with an embedded device and I'd really like to be able to use enums in the sub-byte parts of the packet definitions too. But I can't guess a syntax that might work and I suspect it's not possible, since I can't work out how to declare a partial-byte subtype in C++:I'm exchanging packets with an embedded device