答案1
标准位头是位的枚举。你想要的则完全不同。我建议为它定义一个特殊的宏,基本上是一个没有边框的位框,内容小而粗:
\documentclass{article}
\usepackage{bytefield}
\begin{document}
\pagestyle{empty}
\newcommand\bithead[2]{\bitbox[]{#1}{\scriptsize\bfseries #2}}
\begin{bytefield}[bitwidth=1.7em]{24}
\bithead{3}{12} &
\bithead{4}{11} &
\bithead{4}{4} &
\bithead{5}{0--12} &
\bithead{5}{0--60} &
\bithead{3}{12}\\
\bitbox{3}{Preamble} &
\bitbox{4}{Frame Sync.} &
\bitbox{4}{Device Id} &
\bitbox{5}{Payload} &
\bitbox{5}{Authentication} &
\bitbox{3}{Check Seq.}\\
\end{bytefield}
\end{document}