diff --git a/src/Emulator/Main/Peripherals/UART/UARTBase.cs b/src/Emulator/Main/Peripherals/UART/UARTBase.cs
index 8df4b367d..950387258 100644
--- a/src/Emulator/Main/Peripherals/UART/UARTBase.cs
+++ b/src/Emulator/Main/Peripherals/UART/UARTBase.cs
@@ -15,7 +15,7 @@
 
 namespace Antmicro.Renode.Peripherals.UART
 {
-    public abstract class UARTBase : NullRegistrationPointPeripheralContainer<IUART>, IUART
+    public abstract class UARTBase : NullRegistrationPointPeripheralContainer<IUART>, IUARTWithBufferState
     {
         protected UARTBase(IMachine machine) : base(machine)
         {
@@ -34,6 +34,7 @@ public virtual void WriteChar(byte value)
                 }
 
                 queue.Enqueue(value);
+                BufferStateChanged?.Invoke(BufferState);
                 CharWritten();
             }
         }
@@ -60,6 +61,9 @@ public override void Unregister(IUART uart)
         [field: Transient]
         public event Action<byte> CharReceived;
 
+        public event Action<BufferState> BufferStateChanged;
+        public BufferState BufferState => Count != 0 ? BufferState.Ready : BufferState.Empty;
+
         protected abstract void CharWritten();
         protected abstract void QueueEmptied();
 
@@ -75,6 +79,7 @@ protected bool TryGetCharacter(out byte character)
                 character = queue.Dequeue();
                 if(queue.Count == 0)
                 {
+                    BufferStateChanged?.Invoke(BufferState);
                     QueueEmptied();
                 }
                 return true;
@@ -91,6 +96,7 @@ protected void ClearBuffer()
             lock(innerLock)
             {
                 queue.Clear();
+                BufferStateChanged?.Invoke(BufferState);
                 QueueEmptied();
             }
         }