diff --git a/CPP/register_modeling/example_project/driver/device.cpp b/CPP/register_modeling/example_project/driver/device.cpp
index f160b78..06f4851 100644
--- a/CPP/register_modeling/example_project/driver/device.cpp
+++ b/CPP/register_modeling/example_project/driver/device.cpp
@@ -11,7 +11,8 @@ Device::Device() :
     reg_control.bits.POWER_DEV = Reg_Control::POWER_DEV::TURN_OFF;
     reg_control.bits.SPEED = Reg_Control::SPEED::STAND_STILL;
 
-    std::cout << +reg_control.raw << std::endl;
+    std::cout << "POWER = " << +reg_control.bits.POWER_DEV <<  std::endl;
+    std::cout << "SPEED = " <<+reg_control.bits.SPEED <<  std::endl;
 }
 
 void Device::doSomething()
@@ -19,14 +20,31 @@ void Device::doSomething()
     std::cout << "Device::doSomething()" << std::endl;
 
     reg_control.bits.POWER_DEV = Reg_Control::POWER_DEV::TURN_ON;
-    reg_control.bits.SPEED = Reg_Control::SPEED::NORMAL;
+    reg_control.bits.SPEED = Reg_Control::SPEED::FAST;
 
     if(reg_control.bits.POWER_DEV == Reg_Control::POWER_DEV::TURN_ON){
         std::cout << "device turned on!" << std::endl;
     }
 
     std::cout << "POWER = " << +reg_control.bits.POWER_DEV <<  std::endl;
-    std::cout << "SPEED = " <<+reg_control.bits.SPEED <<  std::endl;
+    std::cout << "SPEED = " << +reg_control.bits.SPEED <<  std::endl;
      
-    std::cout << +reg_control.raw << std::endl;
+    std::cout << +reg_control << std::endl;
+
+    reg_control = 0;
+
+    std::cout << +reg_control << std::endl;
+
+    std::cout << "POWER = " << +reg_control.bits.POWER_DEV <<  std::endl;
+    std::cout << "SPEED = " << +reg_control.bits.SPEED <<  std::endl;
+
+    //reg_control.bits.SPEED = Reg_Control::SPEED::FAST;
+    reg_control.bits.POWER_DEV = Reg_Control::POWER_DEV::TURN_ON;
+    
+    std::cout << "POWER = " << +reg_control.bits.POWER_DEV <<  std::endl;
+    std::cout << "SPEED = " << +reg_control.bits.SPEED <<  std::endl;
+
+
+
+    
 }
\ No newline at end of file
diff --git a/CPP/register_modeling/example_project/driver/device.hpp b/CPP/register_modeling/example_project/driver/device.hpp
index 08efb7c..32f4689 100644
--- a/CPP/register_modeling/example_project/driver/device.hpp
+++ b/CPP/register_modeling/example_project/driver/device.hpp
@@ -65,6 +65,10 @@ class Device
             uint8_t raw;
             // union Ctor with default value set to 0x00
             Reg_Control(uint8_t v = 0x00) : raw(v) {}
+            // raw value extraction of register
+            operator uint8_t() {return raw;}
+            // used for updating software immage of hardware register
+            void operator = (uint8_t v) {raw = v;}
         };
 
         Reg_Control reg_control;
diff --git a/CPP/register_modeling/example_project/main.cpp b/CPP/register_modeling/example_project/main.cpp
index 54a3903..ab862ce 100644
--- a/CPP/register_modeling/example_project/main.cpp
+++ b/CPP/register_modeling/example_project/main.cpp
@@ -42,6 +42,9 @@ int main(void)
 {
     std::cout << "test" << std::endl;
     
+    //std::cout << std::hex << ((1ULL << 2)-1) << std::endl;
+    std::cout << 1ULL << std::endl;
+
     Device dev;
 
     dev.doSomething();
diff --git a/CPP/register_modeling/example_project/runtest b/CPP/register_modeling/example_project/runtest
index e21106f..869ff84 100755
Binary files a/CPP/register_modeling/example_project/runtest and b/CPP/register_modeling/example_project/runtest differ
diff --git a/CPP/register_modeling/example_project/utils/BitField.hpp b/CPP/register_modeling/example_project/utils/BitField.hpp
index aef84a6..7b36c16 100644
--- a/CPP/register_modeling/example_project/utils/BitField.hpp
+++ b/CPP/register_modeling/example_project/utils/BitField.hpp
@@ -47,21 +47,9 @@ struct BitField
      */
     BitField& operator =(T v)
     {
-
-        // this step can be optimised for systems that support bitbandalias 
-        T mask = ((1ULL << SIZE)-1) << START;
-        _raw &= ~mask;
-        _raw |= ((v & ((1ULL << SIZE)-1)) << START);
-        return *this;
-
-
-
-        #ifdef old
-        //TODO: test = problem with |= instead of =
-        // mask creation for v : https://stackoverflow.com/questions/1392059/algorithm-to-generate-bit-mask
-        _raw |= ((v & ((1ULL << SIZE)-1)) << START) ;
+        // use bit band alias if system permits
+        _raw = ((v & ((1ULL << SIZE)-1)) << START) | (_raw & ~(((1ULL << SIZE)-1) << START));
         return *this;
-        #endif
     }
     
     /**
@@ -71,7 +59,7 @@ struct BitField
      */
     operator T() const
     {
-        return _raw >> START;
+        return (_raw >> START) & ((1ULL << SIZE) - 1);
     }
     
     /**
@@ -81,7 +69,7 @@ struct BitField
      */
     T operator ()() const
     {
-        return _raw;
+        return (_raw >> START) & ((1ULL << SIZE) - 1);
     }
     
     private:
diff --git a/CPP/register_modeling/portable_bitfields/BitField.h b/CPP/register_modeling/portable_bitfields/BitField.h
index 0d0e588..a826b6c 100644
--- a/CPP/register_modeling/portable_bitfields/BitField.h
+++ b/CPP/register_modeling/portable_bitfields/BitField.h
@@ -57,8 +57,12 @@ struct BitField
      */
     operator T() const
     {
-        //return _raw >> START;
-        return (_raw & (((1ULL << SIZE)-1) >> START;
+        //return 0;
+        return 0;
+
+        //return (_raw >> START) & ((1ULL << SIZE)-1);
+        //return (_raw >> START) & ((1ULL << SIZE)-1);
+        //return (_raw & (((1ULL << SIZE)-1) << START)) >> START;
     }
     
     /**
@@ -68,7 +72,10 @@ struct BitField
      */
     T operator ()() const
     {
-        return _raw;
+        //return _raw;
+
+        return 0;
+        //return (_raw >> START)  & ((1ULL << SIZE)-1);
     }
     
     private: