diff --git a/eink.hpp b/eink.hpp
index ce1ca0b..c6c1a5d 100644
--- a/eink.hpp
+++ b/eink.hpp
@@ -12,6 +12,8 @@ namespace eink {
 
 template <uint16_t Width, uint16_t Height, typename Spi, io::P RstPin, io::P DcPin, io::P BusyPin>
 class Eink {
+	using word_t = typename Spi::word_t;
+
 	enum class Cmd : uint8_t {
 		DRIVER_OUTPUT_CONTROL = 0x01,
 		DEEP_SLEEP_MODE = 0x10,
@@ -32,6 +34,9 @@ class Eink {
 	static io::Pin<RstPin> m_rst;
 	static io::Pin<DcPin> m_dc;
 	static io::Pin<BusyPin> m_bsy;
+	static constexpr auto THREE_WIRE_SPI = (DcPin == io::P::NONE ? true : false);
+	static_assert((THREE_WIRE_SPI && sizeof(word_t) > 1) || !THREE_WIRE_SPI,
+	              "Three wire SPI requires SPI word size of at least 9 bits");
 
 	static constexpr auto BLOCK_SIZE = 5;
 
@@ -109,11 +114,15 @@ class Eink {
 	static void sendCommand(const Cmd command)
 	{
 		m_dc = false;
-		spiTransfer(static_cast<uint8_t>(command));
+		spiTransfer(static_cast<word_t>(command));
 	}
 
-	static void sendData(const uint8_t data)
+	static void sendData(word_t data)
 	{
+		if constexpr (THREE_WIRE_SPI) {
+			data |= 1 << 8;
+		}
+
 		m_dc = true;
 		spiTransfer(data);
 	}
@@ -201,7 +210,7 @@ class Eink {
 		_delay_ms(100);
 	}
 
-	static void spiTransfer(const uint8_t data)
+	static void spiTransfer(const word_t data)
 	{
 		Spi::select(true);
 		Spi::transfer(data);