diff --git a/src/peripheralwidget.cpp b/src/peripheralwidget.cpp
--- a/src/peripheralwidget.cpp
+++ b/src/peripheralwidget.cpp
@@ -53,7 +53,16 @@ void peripheralWidget::mousePressEvent(Q
 
 void peripheralWidget::mouseMoveEvent(QMouseEvent *event)
 {
-
+    bool match=false;
+    for(int i=0; i<registersWdgts.count();i++)
+    {
+        if(registersWdgts.at(i)->contains(event->pos()))
+        {
+            match = true;
+            QToolTip::showText(event->globalPos(),registersWdgts.at(i)->bitFieldDesc(registersWdgts.at(i)->cursorIndex(event->pos().x())),(QWidget*)this);
+        }
+    }
+    if(!match)QToolTip::hideText();
 }
 
 void peripheralWidget::mouseReleaseEvent(QMouseEvent *event)
@@ -80,6 +89,7 @@ void peripheralWidget::keyPressEvent(QKe
             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/peripheralwidget.h b/src/peripheralwidget.h
--- a/src/peripheralwidget.h
+++ b/src/peripheralwidget.h
@@ -7,13 +7,21 @@
 #include <QList>
 #include <QTimer>
 #include "registerwidget.h"
-
+/*
+ * TODO ADD an outdated marker
+ * Show outdated registers with a different color for example
+*/
 class peripheralWidget : public QWidget
 {
     Q_OBJECT
 public:
     explicit peripheralWidget(const QString& name,qint32 baseAddress, QWidget *parent = 0);
-
+    registerWidget* registerAt(int index)
+    {
+        if(index>=0 && index<registersWdgts.count())
+            return registersWdgts.at(index);
+        return NULL;
+    }
 signals:
     void writeRegSig(qint32 address,qint32 value);
     qint32 readRegSig(qint32 address);
diff --git a/src/registerwidget.cpp b/src/registerwidget.cpp
--- a/src/registerwidget.cpp
+++ b/src/registerwidget.cpp
@@ -113,9 +113,12 @@ void registerWidget::clear(int index)
 
 void registerWidget::set(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))
+    {
+        p_value |= 1<<index;
+        this->p_fieldsEl->setValue(QString("%1").arg((uint)p_value,32,2).replace(" ","0"));
+        emit this->repaint();
+    }
 }
 
 void registerWidget::updateBoundingRect()
@@ -129,11 +132,10 @@ void registerWidget::updateBoundingRect(
 bitfieldsElement::bitfieldsElement(const QString &value, QFont font, int xMargin, int yMargin)
     :regWidgetElement(value,font,xMargin,yMargin)
 {
-    this->attributesLUT.append(new bitFieldAttribute(true,"desc1"));
-    this->attributesLUT.append(new bitFieldAttribute(false,"desc2"));
+    this->attributesLUT.append(new bitFieldAttribute(false,"UNSUSED"));
     for(int i=0;i<32;i++)
     {
-        attributesIndex[i] = i&1;
+        attributesIndex[i] = 0;
     }
     updateBoundingRect();
     p_blinkTextBgColor = QColor(Qt::black);
@@ -154,7 +156,7 @@ QPoint bitfieldsElement::paint(QPainter 
         {
             if(p_cursorBlinkEnable == false || (31-p_cursorIndex) != ((i*4)+l))
             {
-                if(attributesLUT[attributesIndex[(i*4)+l]]->rw==false)
+                if(attributesLUT[attributesIndex[31-((i*4)+l)]]->rw==false)
                 {
                     painter->fillRect(xpos-1,0,p_dx,p_boundingRec.height(),Qt::lightGray);
                 }
diff --git a/src/registerwidget.h b/src/registerwidget.h
--- a/src/registerwidget.h
+++ b/src/registerwidget.h
@@ -79,6 +79,25 @@ public:
     uint cursorIndex();
     uint cursorIndex(int xPos);
     void setFont(QFont font);
+    int addAttribute(const QString& description,bool rw)
+    {
+        attributesLUT.append(new bitFieldAttribute(rw,description));
+        return attributesLUT.count()-1;
+    }
+    int setAttribute(int bitIndex,int attributeIndex)
+    {
+        attributesIndex[bitIndex]=attributeIndex;
+    }
+    QString description(int bitIndex)
+    {
+        return attributesLUT.at(attributesIndex[bitIndex])->description;
+    }
+    bool readonly(int bitIndex)
+    {
+        if(bitIndex>=0 && bitIndex<32)
+            return  !attributesLUT.at(attributesIndex[bitIndex])->rw;
+        return false;
+    }
 private:
     int attributesIndex[32];
     uint p_cursorIndex;
@@ -103,6 +122,22 @@ public:
     uint cursorIndex(int xPos);
     qint32 address();
     qint32 value();
+    void setBitFieldAttribute(uint startIndex,uint stopIndex,const QString& description,bool rw)
+    {
+        if(startIndex<=stopIndex && stopIndex<32)
+        {
+           int index= p_fieldsEl->addAttribute(description,rw );
+           for(uint i=startIndex;i<=stopIndex;i++)
+           {
+                p_fieldsEl->setAttribute(i,index);
+           }
+        }
+    }
+    QString bitFieldDesc(int bitIndex)
+    {
+        return p_fieldsEl->description(bitIndex);
+    }
+
 signals:
     void cursorUp(int pos);
     void cursorDown(int pos);
diff --git a/src/socregsviewer.h b/src/socregsviewer.h
--- a/src/socregsviewer.h
+++ b/src/socregsviewer.h
@@ -5,6 +5,8 @@
 #include <QtWidgets>
 #include "peripheralwidget.h"
 
+
+
 class socRegsViewer : public QScrollArea
 {
     Q_OBJECT