diff --git a/hardware0.hpp b/hardware0.hpp
index 931399d..2cfc727 100644
--- a/hardware0.hpp
+++ b/hardware0.hpp
@@ -103,7 +103,10 @@ class Hardware0 {
 		HardwareImpl::txByteBlocking(byte);
 	}
 
-	static data_t rxByte() FORCE_INLINE {}
+	static bool rxByte(data_t &byte) FORCE_INLINE
+	{
+		return false;
+	}
 
 	static data_t peek() FORCE_INLINE {}
 
@@ -139,7 +142,18 @@ class Hardware0<mode, cfg, Driven::INTERRUPT> {
 		HardwareImpl::enableDataRegEmptyInt();
 	}
 
-	static data_t rxByte() FORCE_INLINE {}
+	static bool rxByte(data_t &byte) FORCE_INLINE
+	{
+		if (sm_rxBuf.head == sm_rxBuf.tail)
+			return false;
+
+		uint8_t tmpTail = (sm_rxBuf.tail + 1) % RX_BUFFER_SIZE;
+
+		byte = sm_rxBuf.buf[tmpTail];
+		sm_rxBuf.tail = tmpTail;
+
+		return true;
+	}
 
 	static data_t peek() FORCE_INLINE {}
 
@@ -148,12 +162,19 @@ class Hardware0<mode, cfg, Driven::INTERRUPT> {
 	                                      detail::ControlFlagsC0, cfg, mode, Driven::INTERRUPT>;
 
 	static constexpr auto TX_BUFFER_SIZE = 16;
+	static constexpr auto RX_BUFFER_SIZE = 16;
 
 	static volatile detail::RingBuffer<data_t, TX_BUFFER_SIZE> sm_txBuf;
+	static volatile detail::RingBuffer<data_t, RX_BUFFER_SIZE> sm_rxBuf;
 
 	static void rxIntHandler()
 	{
-		// TODO
+		uint8_t tmpHead = (sm_rxBuf.head + 1) % RX_BUFFER_SIZE;
+
+		if (tmpHead != sm_rxBuf.tail) {
+			sm_rxBuf.head = tmpHead;
+			sm_rxBuf.buf[tmpHead] = HardwareImpl::rxByteInterrupt();
+		}
 	}
 
 	static void dataRegEmptyIntHandler() FORCE_INLINE
@@ -177,6 +198,11 @@ volatile detail::RingBuffer<typename Hardware0<mode, cfg, Driven::INTERRUPT>::da
                             Hardware0<mode, cfg, Driven::INTERRUPT>::TX_BUFFER_SIZE>
     Hardware0<mode, cfg, Driven::INTERRUPT>::sm_txBuf = {0, 0, {0}};
 
+template <Mode mode, class cfg>
+volatile detail::RingBuffer<typename Hardware0<mode, cfg, Driven::INTERRUPT>::data_t,
+                            Hardware0<mode, cfg, Driven::INTERRUPT>::RX_BUFFER_SIZE>
+    Hardware0<mode, cfg, Driven::INTERRUPT>::sm_rxBuf = {0, 0, {0}};
+
 } // namespace uart
 
 #undef FORCE_INLINE