First opcode table setup.

chapter 2.tex

@@ -1,9 +1,23 @@
 \chapter{Instruction Set Architecture}
-\section{Encoding Schemes}
+
+\newcommand{\OpcodeTable}[4] {
+	\begin{tabularx}{\textwidth}{ | X | X | X | X | }
+		\hline
+		Opcode Hex & Instruction & Operand 1 & Operand 2 \\
+		\hline
+		#1 & #2 & #3 & #4 \\
+		\hline
+	\end{tabularx}
+}
+
 \def\minY{0} \def\maxY{0.5}
 \def\minX{-7} \def\maxX{7}
 
 \usetikzlibrary{decorations.pathreplacing}
+
+\section{Encoding Schemes}
+The /r represents a byte that specifies a register. /iX is for the immediate data type, where \textit{X} defines the width, which are 8, 16, or 32 bits.
+
 \begin{figure}[!htb]
 	\begin{tikzpicture}
 		\draw (\minX, \minY) -- (\maxX, \minY);
@@ -29,3 +43,8 @@
 	\end{tikzpicture}
 	\caption{Short Valued Opcodes}
 \end{figure}
+
+\section{Instructions}
+\subsection{Add}
+\OpcodeTable{01 /r /r}{add /r, /r}{Register}{Register}
+\paragraph{Description} Sums \textit{Operand 1} and \textit{Operand 2} placing the result into \textit{Operand 1}.

document.tex

@@ -1,4 +1,5 @@
 \documentclass[a4paper,12pt]{book}
+\usepackage{tabularx}
 \usepackage{tikz}
 \usetikzlibrary{positioning}
 \usepackage{hyperref}
@@ -16,13 +17,3 @@
 	\include{chapter 2}
 	
 \end{document}
-
-\newcommand{\OpcodeTable}[5] {
-	\begin{tabular}{ c c c c c }
-		\hline
-		Opcode & Bit Pattern & Mnemonic & Operand 1 & Operand 2 \\
-		\hline\hline
-		#1 & #2 & #3 & #4 & #5 \\
-		\hline
-	\end{tabular}
-}