Prescaler, Watchdog, (Cycle-) Timer

src/main/java/fabrik/simulator/pic16f84/Timer.java

@@ -0,0 +1,40 @@
+package fabrik.simulator.pic16f84;
+
+public class Timer {
+    private static final int TIMERREG = 0x1;
+    private static final int T0IF = 0x2;
+    private static final int T0SE = 0x4;
+    private static final int T0CS = 0x5;
+    private static final int INTCON = 0x0B;
+    private static final int OPTION = 0x81;
+
+
+    public static void cycles(int cycles){
+        if (DataRegister.getDirectBit(OPTION, T0CS) == 0){
+            if (PreScaler.isPrescalerOnTimer()){
+                for (int i = 0; i < cycles; i++){
+                    PreScaler.decrement();
+                }
+            } else {
+                increment();
+            }
+        }
+    }
+
+    public static void incrementFromInstructionCycle(){
+        if (DataRegister.getDirectBit(OPTION, T0CS) == 0){
+            increment();
+        }
+    }
+
+    private static void increment() {
+        int timer = DataRegister.getDirectRegister(TIMERREG);
+        timer++;
+        if (timer > 0xFF){
+            DataRegister.setDirectRegister(TIMERREG, 0);
+            DataRegister.setBit(INTCON, T0IF);
+        } else {
+            DataRegister.setDirectRegister(1, timer);
+        }
+    }
+}