diff --git a/src/peripheralwidget.cpp b/src/peripheralwidget.cpp
--- a/src/peripheralwidget.cpp
+++ b/src/peripheralwidget.cpp
@@ -135,6 +135,8 @@ void peripheralWidget::keyPressEvent(QKe
                 break;
             case Qt::Key_W:
                 emit writeRegSig(registersWdgts.at(selectedReg)->address(),registersWdgts.at(selectedReg)->value());
+                registersWdgts.at(selectedReg)->setUpdated(true);
+                registersWdgts.at(selectedReg)->repaint();
                 break;
             case Qt::Key_R:
                 qint32 value;
@@ -171,6 +173,16 @@ void peripheralWidget::keyPressEvent(QKe
             case Qt::Key_Down:
                 down();
                 break;
+            case Qt::Key_W:
+                emit writeRegSig(registersWdgts.at(selectedReg)->address(),registersWdgts.at(selectedReg)->value());
+                registersWdgts.at(selectedReg)->setUpdated(true);
+                registersWdgts.at(selectedReg)->repaint();
+                break;
+            case Qt::Key_R:
+                qint32 value;
+                value = emit readRegSig(registersWdgts.at(selectedReg)->address());
+                registersWdgts.at(selectedReg)->setValue(value);
+                break;
             default:
                 break;
             }
diff --git a/src/registerwidget.cpp b/src/registerwidget.cpp
--- a/src/registerwidget.cpp
+++ b/src/registerwidget.cpp
@@ -132,10 +132,11 @@ QString registerWidget::bitFieldToBin(in
     return QString("Out of range");
 }
 
-void registerWidget::setValue(qint32 value)
+void registerWidget::setValue(qint32 value, bool updated)
 {
     this->p_value = value;
     this->p_fieldsEl->setValue(QString("%1").arg((uint)p_value,32,2).replace(" ","0"));
+    this->p_fieldsEl->setUpdated(updated);
     emit this->repaint();
 }
 
@@ -169,16 +170,25 @@ void registerWidget::leave()
 
 void registerWidget::clear(int index)
 {
-    p_value &= ~(1<<index);
-    this->p_fieldsEl->setValue(QString("%1").arg((uint)p_value,32,2).replace(" ","0"));
-    emit this->repaint();
+    if(!this->p_fieldsEl->readonly(index))
+    {
+        qint32 old = p_value;
+        p_value &= ~(1<<index);
+        if(old!=p_value)
+            p_fieldsEl->setUpdated(false);
+        this->p_fieldsEl->setValue(QString("%1").arg((uint)p_value,32,2).replace(" ","0"));
+        emit this->repaint();
+    }
 }
 
 void registerWidget::set(int index)
 {
     if(!this->p_fieldsEl->readonly(index))
     {
+        qint32 old = p_value;
         p_value |= 1<<index;
+        if(old!=p_value)
+            p_fieldsEl->setUpdated(false);
         this->p_fieldsEl->setValue(QString("%1").arg((uint)p_value,32,2).replace(" ","0"));
         emit this->repaint();
     }
@@ -206,7 +216,9 @@ bitfieldsElement::bitfieldsElement(const
     p_dx=QFontMetrics(p_font).width("0")+4;
     p_blinkTextBgColor = QColor(Qt::black);
     p_blinkTextColor = QColor(Qt::white);
+    p_outdated = QColor(Qt::red);
     p_cursorBlinkEnable = false;
+    p_changed = false;
     updateBoundingRect();
 }
 
@@ -263,7 +275,13 @@ QPoint bitfieldsElement::paint(QPainter 
             painter->drawLine(xpos+(p_xMargins/2),p_boundingRec.height()-6,xpos+(p_xMargins/2),p_boundingRec.height()+6);
         xpos+=p_xMargins;
     }
+    QPen svg = painter->pen();
+    if(p_changed)
+    {
+        painter->setPen(p_outdated);
+    }
     painter->drawRect(0,0,p_boundingRec.width(),p_boundingRec.height());
+    painter->setPen(svg);
     return QPoint(p_boundingRec.width()+4+p_xMargins,0);
 }
 
diff --git a/src/registerwidget.h b/src/registerwidget.h
--- a/src/registerwidget.h
+++ b/src/registerwidget.h
@@ -137,6 +137,10 @@ public:
         }
         return QString("");
     }
+    void setUpdated(bool updated=true)
+    {
+        this->p_changed =  !updated;
+    }
 private:
     uint p_valueUint(int index)
     {
@@ -170,9 +174,10 @@ private:
     uint p_startSelectionIndex;
     uint p_stopSelectionIndex;
     bool p_cursorBlinkEnable;
+    bool p_changed;
     int p_dx;
     QList<bitFieldAttribute*> attributesLUT;
-    QColor p_blinkTextColor,p_blinkTextBgColor;
+    QColor p_blinkTextColor,p_blinkTextBgColor,p_outdated;
 
 };
 
@@ -197,6 +202,10 @@ public:
     QString bitFieldToHex(int bitIndex);
     QString bitFieldToDec(int bitIndex);
     QString bitFieldToBin(int bitIndex);
+    void setUpdated(bool updated=true)
+    {
+        this->p_fieldsEl->setUpdated(updated);
+    }
 signals:
     void cursorUp(int pos);
     void cursorDown(int pos);
@@ -204,7 +213,7 @@ signals:
     void repaint();
 
 public slots:
-    void setValue(qint32 value);
+    void setValue(qint32 value,bool updated=true);
     void blinkCursor();
     void moveCursorLeft(int count);
     void moveCursorRight(int count);