diff --git a/src/lib.rs b/src/lib.rs
index 717c1d8..3c7d74b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,4 @@
-#![no_std]
+#![cfg_attr(not(test), no_std)]
 #![allow(unused)]
 #![deny(rustdoc::broken_intra_doc_links)]
 #![doc = include_str!("../README.md")]
@@ -14,50 +14,68 @@ pub mod tcp;
 pub mod udp;
 mod uninitialized_device;
 
-pub use device::{Device, DeviceRefMut, InactiveDevice};
-pub use host::{Dhcp, Host, HostConfig, Manual};
-pub use net::MacAddress;
-pub use uninitialized_device::{InitializeError, UninitializedDevice};
+#[doc(inline)]
+pub use self::{
+    device::{Device, DeviceRefMut, InactiveDevice},
+    host::{Dhcp, Host, HostConfig, Manual},
+    net::MacAddress,
+    uninitialized_device::{InitializeError, UninitializedDevice}
+};
+
+use register::common;
 
 // TODO add better docs to all public items, add unit tests.
 
 /// Settings for wake on LAN.  Allows the W5500 to optionally emit an interrupt upon receiving a packet
 #[repr(u8)]
-#[derive(Copy, Clone, Debug, PartialOrd, PartialEq)]
+#[derive(Copy, Clone, Debug, PartialOrd, PartialEq, Eq)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum OnWakeOnLan {
     InvokeInterrupt = 0b00100000,
     Ignore = 0b00000000,
 }
 
+/// Ping Block Mode
+///
 /// Settings for ping.  Allows the W5500 to respond to or ignore network ping requests
 #[repr(u8)]
-#[derive(Copy, Clone, Debug, PartialOrd, PartialEq)]
+#[derive(Copy, Clone, Debug, PartialOrd, PartialEq, Eq)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum OnPingRequest {
+    /// 0: Disable Ping block
     Respond = 0b00000000,
+    /// 1 : Enable Ping block
+    ///
+    /// If the bit is ‘1’, it blocks the response to a ping request.
     Ignore = 0b00010000,
 }
 
 /// Use [ConnectionType::PPoE] when talking
 /// to an ADSL modem. Otherwise use [ConnectionType::Ethernet]
 #[repr(u8)]
-#[derive(Copy, Clone, Debug, PartialOrd, PartialEq)]
+#[derive(Copy, Clone, Debug, PartialOrd, PartialEq, Eq)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum ConnectionType {
     PPoE = 0b00001000,
     Ethernet = 0b00000000,
 }
 
-#[derive(Copy, Clone, Debug, PartialOrd, PartialEq)]
+/// Force ARP
+///
+#[derive(Copy, Clone, Debug, PartialOrd, PartialEq, Eq)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[repr(u8)]
 pub enum ArpResponses {
+    /// 0 : Disable Force ARP mode
     Cache = 0b00000000,
+    /// 1 : Enable Force ARP mode
+    ///
+    /// In Force ARP mode, It forces on sending ARP Request whenever data is
+    /// sent.
     DropAfterUse = 0b00000010,
 }
 
-#[derive(Copy, Clone, Debug, PartialEq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct Mode {
     pub on_wake_on_lan: OnWakeOnLan,
@@ -66,6 +84,28 @@ pub struct Mode {
     pub arp_responses: ArpResponses,
 }
 
+impl Mode {
+    pub fn to_register(self) -> [u8; 1] {
+        [self.to_u8()]
+    }
+
+    pub fn to_u8(self) -> u8 {
+        let mut register = 0;
+        register |= self.on_wake_on_lan as u8;
+        register |= self.on_ping_request as u8;
+        register |= self.connection_type as u8;
+        register |= self.arp_responses as u8;
+
+        register
+    }
+}
+
+impl From<Mode> for common::Mode {
+    fn from(value: Mode) -> Self {
+        Self::Mode(value)
+    }
+}
+
 impl Default for Mode {
     fn default() -> Self {
         Self {