Removed comments

Co-authored-by: Darkress <30271678+DarkressX@users.noreply.github.com>
Reviewed-on: darkress/pic16f84-sim#36

de/darkress/pic16f84sim/Main.java

@@ -1,29 +1,30 @@
 package de.darkress.pic16f84sim;
 
+import de.darkress.pic16f84sim.cli.Cli;
 import de.darkress.pic16f84sim.commands.Command;
-import de.darkress.pic16f84sim.decoder.CommandDecoder;
-import de.darkress.pic16f84sim.microcontroller.Cycles;
 import de.darkress.pic16f84sim.microcontroller.Memory;
 import de.darkress.pic16f84sim.microcontroller.ProgramCounter;
+import de.darkress.pic16f84sim.microcontroller.Watchdog;
 import de.darkress.pic16f84sim.parser.Parser;
 
-import java.util.concurrent.TimeUnit;
-
 class Main
 {
-    public static void main(String[] args) throws InterruptedException {
+    public static void main(String[] args) {
 
-        Command[] program = Parser.parser("de/darkress/pic16f84sim/TPicSim101.LST");
-        /*for(int i = 0; i < instructions.size(); i++)
-        {
-            program.add(CommandDecoder.decode(instructions.get(i)));
-        }*/
+        Command[] program = Parser.parser("de/darkress/pic16f84sim/TestPrograms/TPicSim8.LST");
+
+        Memory.initMemory();
 
         while(ProgramCounter.getPc() < 1024)
         {
+            if((Memory.getRegister(0x03) & 0x10) == 0x00) { // Checking WDT in Status Register
+                System.out.println("Resetting device");
+                Watchdog.resetProgram();
+            }
+            String[] instructionName = program[ProgramCounter.getPc()].getClass().toString().split("\\.");
+            System.out.println("Command: " + instructionName[instructionName.length -1]);
             program[ProgramCounter.getPc()].execute();
-            System.out.println(Memory.workingRegister + " " + Cycles.getCycles());
-            System.out.println(Memory.getPCLATH() + " " + Memory.getPCL() + "\n");
+            Cli.showRegisters();
         }
     }
 }

de/darkress/pic16f84sim/cli/Cli.java

@@ -0,0 +1,41 @@
+package de.darkress.pic16f84sim.cli;
+
+import de.darkress.pic16f84sim.microcontroller.Cycles;
+import de.darkress.pic16f84sim.microcontroller.Memory;
+import de.darkress.pic16f84sim.microcontroller.Stack;
+import de.darkress.pic16f84sim.microcontroller.Timer;
+
+public class Cli
+{
+    public static void showRegisters() {
+        printf(Memory.workingRegister, "W-Reg", true);
+        printf(Cycles.getCycles(), "Cycles", false);
+        System.out.printf("%n");
+        printf(Memory.getRegister(0x03), "Status", true);
+        printf(Memory.getOption(), "Option", true);
+        System.out.printf("%n");
+        printf(Memory.getFSR(), "FSR", true);
+        printf(Stack.getStackPointer(), "Stackpointer", true);
+        System.out.printf("%n");
+        printf(Memory.getTimer(), "Timer", true);
+        printf(Timer.getCyclesToTimerIncrease(), "Prescaler", true);
+        System.out.printf("%n");
+        printf(Memory.getPCLATH(), "PCLATH", true);
+        printf(Memory.getPCL(), "PCL", true);
+        System.out.printf("%n");
+        System.out.printf("%s:\t\t%s\t", "PortA", Integer.toBinaryString(Memory.getPortA()));
+        System.out.printf("%s:\t\t%s\t", "PortB", Integer.toBinaryString(Memory.getPortB()));
+        System.out.printf("%n");
+        printf(Memory.getRegister(0x0B), "IntCon", true);
+        System.out.printf("%n");
+    }
+
+    private static void printf(int value, String description, boolean hex) {
+        if(hex) {
+            System.out.printf("%s:\t\t%s\t", description, Integer.toHexString(value));
+        } else {
+            System.out.printf("%s:\t\t%d\t", description, value);
+        }
+
+    }
+}

de/darkress/pic16f84sim/commands/Addlw.java

@@ -16,6 +16,8 @@ public class Addlw extends LiteralCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = literal + Memory.workingRegister;
 
         checkZeroBit(result);
@@ -23,7 +25,5 @@ public class Addlw extends LiteralCommandUtils implements Command
         checkDigitCarryBit(literal);
 
         Memory.workingRegister = result % 256;
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Addwf.java

@@ -18,6 +18,8 @@ public class Addwf extends FileRegisterCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = Memory.getRegister(address) + Memory.workingRegister;
 
         checkZeroBit(result);
@@ -25,7 +27,5 @@ public class Addwf extends FileRegisterCommandUtils implements Command
         checkDigitCarryBit(address);
 
         writeToDestination(destinationBit, address, result);
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Andlw.java

@@ -15,12 +15,12 @@ public class Andlw extends LiteralCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = literal & Memory.workingRegister;
 
         checkZeroBit(result);
 
         Memory.workingRegister = result % 256;
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Andwf.java

@@ -18,12 +18,12 @@ public class Andwf extends FileRegisterCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = Memory.getRegister(address) & Memory.workingRegister;
 
         checkZeroBit(result);
 
         writeToDestination(destinationBit, address, result);
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Bcf.java

@@ -18,11 +18,11 @@ public class Bcf extends BitOrientedCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = Memory.getRegister(address);
         result &= ~(1 << bitPlacement); //Mask n-th bit with 0
 
         Memory.setRegister(address, result);
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Bsf.java

@@ -18,11 +18,11 @@ public class Bsf extends BitOrientedCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = Memory.getRegister(address);
         result |= (1 << bitPlacement);
 
         Memory.setRegister(address, result);
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Btfsc.java

@@ -18,15 +18,14 @@ public class Btfsc extends BitOrientedCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = Memory.getRegister(address);
 
         if((result & (1 << bitPlacement)) == 0) //Test if bit is clear
         {
-            ProgramCounter.incPC();
-            Cycles.addToCycles(1);
+            Nop nop = new Nop();
+            nop.execute();
         }
-
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Btfss.java

@@ -18,15 +18,14 @@ public class Btfss extends BitOrientedCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = Memory.getRegister(address);
 
         if((result & (1 << bitPlacement)) > 0) //Test if bit is set
         {
-            ProgramCounter.incPC();
-            Cycles.addToCycles(1);
+            Nop nop = new Nop();
+            nop.execute();
         }
-
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Call.java

@@ -16,8 +16,9 @@ public class Call extends LiteralCommandUtils implements Command
     @Override
     public void execute()
     {
+        Cycles.incCycles();
         Stack.push(ProgramCounter.getPc() + 1);
         ProgramCounter.setPcFrom11BitLiteral(literal);
-        Cycles.addToCycles(2);
+        Cycles.incCycles(); //Simulate nop and 2-Cycle instruction
     }
 }

de/darkress/pic16f84sim/commands/Clrf.java

@@ -1,7 +1,6 @@
 package de.darkress.pic16f84sim.commands;
 
 import de.darkress.pic16f84sim.microcontroller.Cycles;
-import de.darkress.pic16f84sim.microcontroller.Memory;
 import de.darkress.pic16f84sim.microcontroller.ProgramCounter;
 
 public class Clrf extends FileRegisterCommandUtils implements Command
@@ -18,12 +17,12 @@ public class Clrf extends FileRegisterCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         final int result = 0;
 
         checkZeroBit(result);
 
         writeToDestination(destinationBit, address, result);
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Clrw.java

@@ -9,12 +9,12 @@ public class Clrw extends FileRegisterCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         final int result = 0;
 
         checkZeroBit(result);
 
         Memory.workingRegister = result;
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Clrwdt.java

@@ -0,0 +1,24 @@
+package de.darkress.pic16f84sim.commands;
+
+import de.darkress.pic16f84sim.microcontroller.*;
+
+public class Clrwdt extends LiteralCommandUtils implements Command
+{
+
+    public Clrwdt()
+    {
+    }
+
+    @Override
+    public void execute()
+    {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
+
+        Memory.setRegister(0x03, Memory.getRegister(0x03) | 0x18);
+        if(Timer.getPrescalerAssignment()) {
+            Timer.resetTimeToTimerIncrease();
+            Watchdog.resetWatchdogTimer();
+        }
+    }
+}

de/darkress/pic16f84sim/commands/Comf.java

@@ -18,12 +18,12 @@ public class Comf extends FileRegisterCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = 255 - Memory.getRegister(address); // Get inverse of 8Bit value
 
         checkZeroBit(result);
 
         writeToDestination(destinationBit, address, result);
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Decf.java

@@ -18,12 +18,12 @@ public class Decf extends FileRegisterCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = Memory.getRegister(address) + 255; // Allow underflow
 
         checkZeroBit(result);
 
         writeToDestination(destinationBit, address, result % 256); // Catch underflow
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Decfsz.java

@@ -18,6 +18,8 @@ public class Decfsz extends FileRegisterCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = Memory.getRegister(address) + 255; // Allow underflow
 
         checkZeroBit(result);
@@ -26,10 +28,8 @@ public class Decfsz extends FileRegisterCommandUtils implements Command
 
         if((result % 256) == 0)
         {
-            ProgramCounter.incPC();
-            Cycles.addToCycles(1);
+            Nop nop = new Nop();
+            nop.execute();
         }
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Goto.java

@@ -15,7 +15,8 @@ public class Goto extends LiteralCommandUtils implements Command
     @Override
     public void execute()
     {
+        Cycles.incCycles();
         ProgramCounter.setPcFrom11BitLiteral(literal);
-        Cycles.addToCycles(2);
+        Cycles.incCycles();
     }
 }

de/darkress/pic16f84sim/commands/Incf.java

@@ -18,12 +18,12 @@ public class Incf extends FileRegisterCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = Memory.getRegister(address) + 1; // Allow underflow
 
         checkZeroBit(result);
 
         writeToDestination(destinationBit, address, result % 256); // Catch underflow
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Incfsz.java

@@ -18,6 +18,8 @@ public class Incfsz extends FileRegisterCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = Memory.getRegister(address) + 1;
 
         checkZeroBit(result);
@@ -26,10 +28,8 @@ public class Incfsz extends FileRegisterCommandUtils implements Command
 
         if((result % 256) == 0)
         {
-            ProgramCounter.incPC();
-            Cycles.addToCycles(1);
+            Nop nop = new Nop();
+            nop.execute();
         }
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Iorlw.java

@@ -15,12 +15,12 @@ public class Iorlw extends LiteralCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = literal | Memory.workingRegister;
 
         checkZeroBit(result);
 
         Memory.workingRegister = result % 256;
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Iorwf.java

@@ -18,12 +18,12 @@ public class Iorwf extends FileRegisterCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = Memory.getRegister(address) | Memory.workingRegister;
 
         checkZeroBit(result);
 
         writeToDestination(destinationBit, address, result);
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Movf.java

@@ -18,12 +18,12 @@ public class Movf extends FileRegisterCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = Memory.getRegister(address);
 
         checkZeroBit(result);
 
         writeToDestination(destinationBit, address, result);
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Movlw.java

@@ -16,8 +16,8 @@ public class Movlw extends LiteralCommandUtils implements Command
     @Override
     public void execute()
     {
-        Memory.workingRegister = literal;
         ProgramCounter.incPC();
-        Cycles.addToCycles(1);
+        Cycles.incCycles();
+        Memory.workingRegister = literal;
     }
 }

de/darkress/pic16f84sim/commands/Movwf.java

@@ -18,10 +18,10 @@ public class Movwf extends FileRegisterCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = Memory.workingRegister;
 
         writeToDestination(destinationBit, address, result);
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Nop.java

@@ -11,6 +11,6 @@ public class Nop extends LiteralCommandUtils implements Command
     {
         // Do nothing, just increment the PC
         ProgramCounter.incPC();
-        Cycles.addToCycles(1);
+        Cycles.incCycles();
     }
 }

de/darkress/pic16f84sim/commands/Retfie.java

@@ -0,0 +1,18 @@
+package de.darkress.pic16f84sim.commands;
+
+import de.darkress.pic16f84sim.microcontroller.Cycles;
+import de.darkress.pic16f84sim.microcontroller.Memory;
+import de.darkress.pic16f84sim.microcontroller.ProgramCounter;
+import de.darkress.pic16f84sim.microcontroller.Stack;
+
+public class Retfie extends LiteralCommandUtils implements Command
+{
+    @Override
+    public void execute()
+    {
+        Cycles.incCycles();
+        Memory.setRegister(0x0B, Memory.getRegister(0x0B) | 0x80); //Set GIE
+        ProgramCounter.setPcFromStack(Stack.pop() + 1);
+        Cycles.incCycles(); // Simulate 2-Cycle Instruction
+    }
+}

de/darkress/pic16f84sim/commands/Retlw.java

@@ -17,8 +17,9 @@ public class Retlw extends LiteralCommandUtils implements Command
     @Override
     public void execute()
     {
+        Cycles.incCycles();
         Memory.workingRegister = literal;
         ProgramCounter.setPcFromStack(Stack.pop());
-        Cycles.addToCycles(2);
+        Cycles.incCycles(); // Simulate 2-Cycle Instruction
     }
 }

de/darkress/pic16f84sim/commands/Return.java

@@ -9,7 +9,8 @@ public class Return extends LiteralCommandUtils implements Command
     @Override
     public void execute()
     {
+        Cycles.incCycles();
         ProgramCounter.setPcFromStack(Stack.pop());
-        Cycles.addToCycles(2);
+        Cycles.incCycles(); // Simulate 2-Cycle Instruction
     }
 }

de/darkress/pic16f84sim/commands/Rlf.java

@@ -18,6 +18,8 @@ public class Rlf extends FileRegisterCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int register = Memory.getRegister(address);
         int newCarry = register >>7;
         int oldCarry = Memory.getCarryBit();
@@ -31,7 +33,5 @@ public class Rlf extends FileRegisterCommandUtils implements Command
         }
 
         writeToDestination(destinationBit, address, register);
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Rrf.java

@@ -18,6 +18,8 @@ public class Rrf extends FileRegisterCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int register = Memory.getRegister(address);
         int newCarry = register & 0x01;
         int oldCarry = Memory.getCarryBit();
@@ -31,7 +33,5 @@ public class Rrf extends FileRegisterCommandUtils implements Command
         }
 
         writeToDestination(destinationBit, address, register);
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Sublw.java

@@ -36,6 +36,8 @@ public class Sublw extends LiteralCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = literal - Memory.workingRegister + 256;
 
         checkZeroBit(result);
@@ -43,7 +45,5 @@ public class Sublw extends LiteralCommandUtils implements Command
         checkDigitCarryBit(literal);
 
         Memory.workingRegister = result % 256;
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Subwf.java

@@ -38,6 +38,8 @@ public class Subwf extends FileRegisterCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = Memory.getRegister(address) - Memory.workingRegister + 256;
 
         checkZeroBit(result);
@@ -45,7 +47,5 @@ public class Subwf extends FileRegisterCommandUtils implements Command
         checkDigitCarryBit(Memory.getRegister(address));
 
         writeToDestination(destinationBit, address, result % 256);
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Swapf.java

@@ -18,12 +18,12 @@ public class Swapf extends FileRegisterCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = (Memory.getRegister(address) <<4) & 0xF0;
         int tmp = Memory.getRegister(address) >>4;
         result += tmp;
 
         writeToDestination(destinationBit, address, result);
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Xorlw.java

@@ -15,12 +15,12 @@ public class Xorlw extends LiteralCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = literal ^ Memory.workingRegister;
 
         checkZeroBit(result);
 
         Memory.workingRegister = result % 256;
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/commands/Xorwf.java

@@ -18,12 +18,12 @@ public class Xorwf extends FileRegisterCommandUtils implements Command
     @Override
     public void execute()
     {
+        ProgramCounter.incPC();
+        Cycles.incCycles();
         int result = Memory.getRegister(address) ^ Memory.workingRegister;
 
         checkZeroBit(result);
 
         writeToDestination(destinationBit, address, result);
-        ProgramCounter.incPC();
-        Cycles.addToCycles(1);
     }
 }

de/darkress/pic16f84sim/decoder/CommandDecoder.java

@@ -97,12 +97,12 @@ public class CommandDecoder
 
         if (input == 0x0064)
         {
-            //clrwdt();
+            return new Clrwdt();
         }
 
         if (input == 0x0009)
         {
-            //retfie();
+            return new Retfie();
         }
 
         if (input == 0x0008)

de/darkress/pic16f84sim/microcontroller/Cycles.java

@@ -3,9 +3,10 @@ package de.darkress.pic16f84sim.microcontroller;
 public class Cycles {
     private static int cycles = 0;
 
-    public static void addToCycles(int increase)
+    public static void incCycles()
     {
-        cycles += increase;
+        Timer.decreasePrescaler();
+        cycles++;
     }
 
     public static int getCycles() {

de/darkress/pic16f84sim/microcontroller/Interrupt.java

@@ -0,0 +1,13 @@
+package de.darkress.pic16f84sim.microcontroller;
+
+public class Interrupt
+{
+    private static boolean globalInterruptEnabled() {
+        return (Memory.getRegister(0x0B) & 0x80) == 0x80; // Check GIE
+
+    }
+    public static boolean checkTimerInterruptConditions() {
+        boolean timerInterruptEnabled = (Memory.getRegister(0x0B) & 0x20) == 0x20;
+        return globalInterruptEnabled() && timerInterruptEnabled;
+    }
+}

de/darkress/pic16f84sim/microcontroller/Memory.java

@@ -4,6 +4,13 @@ import java.util.Arrays;
 
 public class Memory
 {
+    public static void initMemory()
+    {
+        Memory.memory[0x81] = 0xFF; //Option
+        Memory.memory[0x85] = 0x1F; //TrisA
+        Memory.memory[0x86] = 0xFF; //TrisB
+        Memory.setRegister(0x03, 0x18); //Status
+    }
     private static final int MEMORY_SIZE = 0xFF;  //Addressable Memory
     public static int workingRegister = 0;
     private static final int[] memory = new int[MEMORY_SIZE];
@@ -47,12 +54,20 @@ public class Memory
             setDataFromIndirectAddress(indirectAddress, data);
             return;
         }
+        if(address == 0x01 && !Timer.getPrescalerAssignment()) //Reset PrescalerCounter if change on Option or Timer
+            // Register
+        {
+            Timer.resetTimeToTimerIncrease();
+            Timer.setCyclesToTimerIncrease(Timer.getCyclesToTimerIncrease() - 1); //Decrease by one to account for
+            // this command execution
+        }
         if((Arrays.stream(bank0UniqueSpecialRegister).anyMatch(x -> x == address)) && getRegisterBank() == 0)
         {
             memory[address] = data;
             return;
         }
-        if((Arrays.stream(bank1UniqueSpecialRegister).anyMatch(x -> x == address)) && getRegisterBank() == 1)
+        if((Arrays.stream(bank0UniqueSpecialRegister).anyMatch(x -> x == address)) && getRegisterBank() == 1) //bank0
+            // because of 7 Bit address
         {
             memory[address + 128] = data;
             return;
@@ -72,6 +87,12 @@ public class Memory
 
     private static void setDataFromIndirectAddress(int address, int data)
     {
+        if((address == 0x81 || address == 0x01) && !Timer.getPrescalerAssignment()) //Reset PrescalerCounter if change on Option or Timer Register
+        {
+            Timer.resetTimeToTimerIncrease();
+            Timer.setCyclesToTimerIncrease(Timer.getCyclesToTimerIncrease() - 1); //Decrease by one to account for
+            // this command execution
+        }
         if((Arrays.stream(bank0UniqueSpecialRegister).anyMatch(x -> x == address)) || (Arrays.stream(bank1UniqueSpecialRegister).anyMatch(x -> x == address)))
         {
             memory[address] = data;
@@ -79,10 +100,6 @@ public class Memory
         }
         memory[address % 128] = data; // else: Registers.Registers which are mapped
         memory[address % 128 + 128] = data; //Ensure data is written to both banks to simulate mapping
-        if(address == 0x2) //Check if PCL is destination
-        {
-            ProgramCounter.loadPc();
-        }
     }
 
     private static int getRegisterBank()
@@ -94,7 +111,7 @@ public class Memory
         return 1;
     }
 
-    private static int getFSR()
+    public static int getFSR()
     {
         return memory[0x4];
     }
@@ -121,6 +138,28 @@ public class Memory
         memory[0x8A] = data & 0x1F;
     }
 
+    public static int getOption()
+    {
+        return memory[0x81];
+    }
+
+    public static int getPortB() {
+        return memory[0x06];
+    }
+
+    public static int getPortA() {
+        return memory[0x05] & 0x1F;
+    }
+    public static int getTimer()
+    {
+        return memory[0x01];
+    }
+
+    public static void setTimer(int data)
+    {
+        memory[0x01] = data;
+    }
+
     public static boolean getZeroBit()
     {
         return (memory[0x03] & 0x04) == 0x04;

de/darkress/pic16f84sim/microcontroller/ProgramCounter.java

@@ -36,4 +36,12 @@ public class ProgramCounter
         pc++;
         Memory.setPCL(pc & 0x00FF);
     }
+
+    public static void setProgramCounter(int value) {
+        if(value <= 0xFF && value >= 0)
+        {
+            pc = value;
+            Memory.setPCL(pc);
+        }
+    }
 }

de/darkress/pic16f84sim/microcontroller/Stack.java

@@ -18,10 +18,6 @@ public class Stack
         return stack[stackPointer];
     }
 
-    public static int peek()
-    {
-        return stack[(stackPointer + 7) % 8]; //Get TopOfStack -1 +8 = 7 and modulo 8 to avoid IndexOutOfBound
-    }
 
     private static void pointNext()
     {

de/darkress/pic16f84sim/microcontroller/Timer.java

@@ -0,0 +1,82 @@
+package de.darkress.pic16f84sim.microcontroller;
+
+public class Timer
+{
+    public static int getCyclesToTimerIncrease()
+    {
+        return cyclesToTimerIncrease;
+    }
+
+    public static void setCyclesToTimerIncrease(int cyclesToTimerIncrease)
+    {
+        Timer.cyclesToTimerIncrease = cyclesToTimerIncrease;
+    }
+
+    private static int cyclesToTimerIncrease = 1;
+
+    private static boolean timerEnabled()
+    {
+        return (Memory.getOption() & 0x20) != 0x20;
+    }
+
+    public static void resetTimeToTimerIncrease()
+    {
+        cyclesToTimerIncrease = getPrescalerFactor();
+    }
+
+    public static boolean getPrescalerAssignment() {
+        return (Memory.getOption() & 0x08) == 0x08;
+    }
+
+    private static int getPrescalerFactor() {
+        final int MULTIPLIER = 2;
+        int prescalerPower = Memory.getOption() & 0x07;
+        int prescaler = (int)Math.pow(2, prescalerPower);
+        if(!getPrescalerAssignment())
+        {
+            return prescaler * MULTIPLIER;
+        }
+        return prescaler;
+    }
+
+    private static void increaseTimerRegister()
+    {
+        int timerRegister = Memory.getRegister(0x01);
+        timerRegister = (timerRegister + 1) % 256;
+        if(timerRegister == 0) //check for timer Overflow  --> interrupt
+        {
+            System.out.println("Timer Overflow");
+            Memory.setRegister(0x0B, Memory.getRegister(0x0B) | 0x04); //set T0IF
+            if(Interrupt.checkTimerInterruptConditions())
+            {
+                Stack.push(ProgramCounter.getPc());
+                ProgramCounter.setProgramCounter(0x04); // Interrupt Vector
+            }
+        }
+        Memory.setTimer(timerRegister);
+    }
+
+    public static void decreasePrescaler()
+    {
+        if(getPrescalerAssignment()) { // Assigned to WatchdogTimer
+            cyclesToTimerIncrease--;
+            if(cyclesToTimerIncrease == 0) {
+                resetTimeToTimerIncrease();
+                Watchdog.decreaseWatchdogTimer();
+            }
+        } else {
+            Watchdog.decreaseWatchdogTimer();
+        }
+        if(timerEnabled()) {
+            if(!getPrescalerAssignment()) { // Assigned to timer0
+                cyclesToTimerIncrease--;
+                if(cyclesToTimerIncrease == 0) {
+                    resetTimeToTimerIncrease();
+                    Timer.increaseTimerRegister();
+                }
+            } else {
+                Timer.increaseTimerRegister();
+            }
+        }
+    }
+}

de/darkress/pic16f84sim/microcontroller/Watchdog.java

@@ -0,0 +1,37 @@
+package de.darkress.pic16f84sim.microcontroller;
+
+public class Watchdog
+{
+    private static int watchdogTimer = 18000;
+    public static int getWatchdogTimer()
+    {
+        return watchdogTimer;
+    }
+
+    public static void resetWatchdogTimer() {
+        watchdogTimer = 18000;
+    }
+
+    public static void decreaseWatchdogTimer()
+    {
+        watchdogTimer--;
+        checkWatchdog();
+    }
+
+    private static void checkWatchdog()
+    {
+        if(watchdogTimer == 0)
+        {
+            System.out.println("Watchdog Time-Out");
+            Memory.setRegister(0x03, Memory.getRegister(0x03) & 0xEF); //Clear !TO in StatusReg
+        }
+    }
+
+    public static void resetProgram()
+    {
+        Memory.setRegister(0x03, Memory.getRegister(0x03) | 0x10); //Set !T0 in StatusReg
+        ProgramCounter.setProgramCounter(0);
+        watchdogTimer = 18000;
+    }
+
+}