From 5c646a48358cb6f5f02deccaf9b9261982b37f60 Mon Sep 17 00:00:00 2001
From: Garritt McCune <glmccune@gmail.com>
Date: Fri, 19 Jul 2024 00:53:29 -0500
Subject: [PATCH] First opcode table setup.

---
 chapter 2.tex | 23 +++++++++++++++++++++--
 document.tex  | 13 ++-----------
 2 files changed, 23 insertions(+), 13 deletions(-)

diff --git a/chapter 2.tex b/chapter 2.tex
index 5ecdd7a..818b2c6 100644
--- a/chapter 2.tex	
+++ b/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);
@@ -28,4 +42,9 @@
 		\draw [decorate, decoration={brace, amplitude=1em, mirror}] (0, -\maxY) -- (\maxX, -\maxY) node[midway, below=1em] {Near Address (16-bits)};
 	\end{tikzpicture}
 	\caption{Short Valued Opcodes}
-\end{figure}
\ No newline at end of file
+\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}.
\ No newline at end of file
diff --git a/document.tex b/document.tex
index 8bc095d..a14de7c 100644
--- a/document.tex
+++ b/document.tex
@@ -1,4 +1,5 @@
 \documentclass[a4paper,12pt]{book}
+\usepackage{tabularx}
 \usepackage{tikz}
 \usetikzlibrary{positioning}
 \usepackage{hyperref}
@@ -15,14 +16,4 @@
 	\include{chapter 1}
 	\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}
-}
\ No newline at end of file
+\end{document}
\ No newline at end of file