From 3f78a00be840f660132b81b22c943d725f4f868e Mon Sep 17 00:00:00 2001
From: Garritt McCune <gmccune@corp.dpcpipe.com>
Date: Wed, 7 Aug 2024 16:52:28 -0500
Subject: [PATCH] Updated the way the mode setting works by allocating an
 entire byte for it.

---
 chapter 2.tex | 37 ++++++++++++++++++-------------------
 1 file changed, 18 insertions(+), 19 deletions(-)

diff --git a/chapter 2.tex b/chapter 2.tex
index 5c073ef..b2f179c 100644
--- a/chapter 2.tex	
+++ b/chapter 2.tex	
@@ -26,13 +26,29 @@ All instructions are a fixed width of 32-bits. There are two basic encoding sche
 		\draw (-8, 0) -- (-4, 0) node[midway, below=1em] {Opcode};
 		\draw (-8, -0.25) -- (-8, 0.25) node[above] {7};
 		\draw (-4, -0.25) -- (-4, 0.25) node[above] {0};
-		\draw [dashed] (-3.75, 0) -- (0, 0) node[midway, above=1em] {Mode Setting};
+		\draw (-3.75, 0) -- (0, 0) node[midway, below=1em] {Mode Setting};
+		\draw (-1.9, -0.25) -- (-1.9, 0.25) node[above] {3};
 		\draw (-3.75, -0.25) node[below] {7} -- (-3.75, 0.25);
 		\draw (0, -0.25) node[below] {0} -- (0, 0.25);
 	\end{tikzpicture}
 	\caption{Encoding}
 	\label{fig:opencoding} % https://www.overleaf.com/learn/latex/Referencing_Figures
-	\paragraph{Note} The dotted line showing the \textit{Mode Setting} byte can be optional in some instructions.
+\end{figure}
+
+\begin{figure}
+	\begin{tabularx}{\textwidth}{ | X | X | X | }
+		\hline
+		Operand & Immediate Value & Value As Address \\
+		\hline
+		Register & 0000 & 1000 \\
+		8-Bit & 0001 & 1001 \\
+		16-Bit & 0010 & 1010 \\
+		32-Bit & 0100 & 1100 \\
+		None & 1111 & 1111 \\
+		\hline
+	\end{tabularx}
+	\caption{Operand Modes Bit Pattern}
+	\label{fig:ModeSettingEncodingFigure} % https://www.overleaf.com/learn/latex/Referencing_Figures
 \end{figure}
 
 
@@ -63,23 +79,6 @@ All instructions are a fixed width of 32-bits. There are two basic encoding sche
 	\label{fig:OpArgEncodingFigure} % https://www.overleaf.com/learn/latex/Referencing_Figures
 	\paragraph{Note} How the \textit{Destination} and \textit{Source} are interpreted is dependent on the opcode and operand mode bits as shown in Figure \ref{fig:AddressingModeBitPattern}.
 \end{figure}
-\begin{figure}
-	\begin{tabularx}{\textwidth}{ | X | X | X | }
-		\hline
-		Bit Pattern & Destination & Source \\
-		\hline
-		0000 & Register & Register \\
-		0001 & Register & 8 Bit Immediate \\
-		0010 & Register & 32 Bit Immediate \\
-		0011 & 8 Bit Immediate & Register \\
-		0100 & 32 Bit Immediate & Register \\
-		\hline
-	\end{tabularx}
-	\caption{Addressing Mode}
-	\label{fig:AddressingModeBitPattern}
-	\paragraph{Note} The \textit{Immediate} values could represent an address (if 8-bit, relative otherwise 32-bit values will represent absolute addresses) or a numeric constant. 
-\end{figure}
-
 \clearpage
 \section{Instructions}
 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.