Andlw instruction (#5)

commands/Andlw.java

@@ -0,0 +1,22 @@
+package commands;
+
+import registers.Memory;
+
+public class Andlw extends CommandUtils implements Command
+{
+    private final int literal;
+
+    public Andlw(int input)
+    {
+        literal = input & 0x00FF;
+    }
+    @Override
+    public void execute()
+    {
+        int result = literal & Memory.workingRegister;
+
+        checkZeroBit(result);
+
+        Memory.workingRegister = result % 256;
+    }
+}

decoder/CommandDecoder.java

@@ -1,6 +1,7 @@
 package decoder;
 
 import commands.Addlw;
+import commands.Andlw;
 import commands.Command;
 
 public class CommandDecoder
@@ -52,8 +53,7 @@ public class CommandDecoder
                 //xorwf();
                 break;
             case 0x3900:
-                //andlw();
-                break;
+                return new Andlw(input);
             case 0x3800:
                 //iorlw();
                 break;