diff --git a/hardware0.hpp b/hardware0.hpp
index 7f352c9..4bc9204 100644
--- a/hardware0.hpp
+++ b/hardware0.hpp
@@ -32,6 +32,39 @@ struct Registers0 {
 	static constexpr volatile auto *BAUD_REG_H = &UBRR0H;
 };
 
+enum ControlFlagsA {
+	MULTI_PROC_COMM_MODE = MPCM0,
+	SPEED_2X = U2X0,
+	PARITY_ERROR = UPE0,
+	DATA_OVER_RUN = DOR0,
+	FRAME_ERROR = FE0,
+	DATA_REG_EMPTY = UDRE0,
+	TRANSMIT_COMPLETE = TXC0,
+	RECEIVE_COMPLETE = RXC0,
+};
+
+enum ControlFlagsB {
+	TX_DATA_BIT_8 = TXB80,
+	RX_DATA_BIT_8 = RXB80,
+	CHAR_SIZE_2 = UCSZ02,
+	TX_ENABLE = TXEN0,
+	RX_ENABLE = RXEN0,
+	DATA_REG_EMPTY_INT_ENABLE = UDRIE0,
+	TX_INT_ENABLE = TXCIE0,
+	RX_INT_ENABLE = RXCIE0,
+};
+
+enum ControlFlagsC {
+	CLK_POLARITY = UCPOL0,
+	CHAR_SIZE_0 = UCSZ00,
+	CHAR_SIZE_1 = UCSZ01,
+	STOP_BIT_SEL = USBS0,
+	PARITY_MODE_0 = UPM00,
+	PARITY_MODE_1 = UPM01,
+	MODE_SEL_0 = UMSEL00,
+	MODE_SEL_1 = UMSEL01,
+};
+
 static constexpr auto getLastRxError() {}
 static constexpr void set2xSpeed() {}
 
@@ -116,17 +149,17 @@ class Hardware0 {
 			dataBitsVal.regCVal = 0;
 			break;
 		case DataBits::SIX:
-			dataBitsVal.regCVal = (1 << UCSZ00);
+			dataBitsVal.regCVal = (1 << detail::CHAR_SIZE_0);
 			break;
 		case DataBits::SEVEN:
-			dataBitsVal.regCVal = (1 << UCSZ01);
+			dataBitsVal.regCVal = (1 << detail::CHAR_SIZE_1);
 			break;
 		case DataBits::EIGHT:
-			dataBitsVal.regCVal = (1 << UCSZ01) | (1 << UCSZ00);
+			dataBitsVal.regCVal = (1 << detail::CHAR_SIZE_1) | (1 << detail::CHAR_SIZE_0);
 			break;
 		case DataBits::NINE:
-			dataBitsVal.regCVal = (1 << UCSZ01) | (1 << UCSZ00);
-			dataBitsVal.regBVal = (1 << UCSZ02);
+			dataBitsVal.regCVal = (1 << detail::CHAR_SIZE_1) | (1 << detail::CHAR_SIZE_0);
+			dataBitsVal.regBVal = (1 << detail::CHAR_SIZE_2);
 			break;
 		}
 
@@ -138,9 +171,9 @@ class Hardware0 {
 		uint8_t parityVal = 0;
 
 		if (PARITY == Parity::EVEN)
-			parityVal = (1 << UPM01);
+			parityVal = (1 << detail::PARITY_MODE_1);
 		else if (PARITY == Parity::ODD)
-			parityVal = (1 << UPM01) | (1 << UPM00);
+			parityVal = (1 << detail::PARITY_MODE_1) | (1 << detail::PARITY_MODE_0);
 
 		return parityVal;
 	}
@@ -150,7 +183,7 @@ class Hardware0 {
 		uint8_t stopBitsVal = 0;
 
 		if (STOP_BITS == StopBits::TWO)
-			stopBitsVal = (1 << USBS0);
+			stopBitsVal = (1 << detail::STOP_BIT_SEL);
 
 		return stopBitsVal;
 	}
@@ -162,7 +195,7 @@ class Hardware0 {
 		uint8_t modeVal = 0;
 
 		if (mode == Mode::SYNCHRONOUS_MASTER || mode == Mode::SYNCHRONOUS_SLAVE) {
-			modeVal = (1 << UMSEL00);
+			modeVal = (1 << detail::MODE_SEL_0);
 		}
 
 		return modeVal;
@@ -174,7 +207,7 @@ class Hardware0 {
 		uint8_t enableVal = 0;
 
 		if (enable)
-			enableVal = (1 << RXEN0);
+			enableVal = (1 << detail::RX_ENABLE);
 
 		return enableVal;
 	}
@@ -185,7 +218,7 @@ class Hardware0 {
 		uint8_t enableVal = 0;
 
 		if (enable)
-			enableVal = (1 << TXEN0);
+			enableVal = (1 << detail::TX_ENABLE);
 
 		return enableVal;
 	}