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diff --git a/doc/using/UART_srcs/capitalisation/capitalisation.vhd b/doc/using/UART_srcs/capitalisation/capitalisation.vhd
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+++ b/doc/using/UART_srcs/capitalisation/capitalisation.vhd
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+-- loopback engine
+----------------------------------------------------------------------
+library IEEE;
+use IEEE.STD_LOGIC_1164.all;
+use ieee.numeric_std.all;
+
+entity capitalisation is
+  port(
+    clk        : in  std_logic;
+    reset      : in  std_logic;
+    --in
+    rdata      : in  std_logic_vector(7 downto 0);
+    rd_en      : in  std_logic;
+    rd         : out std_logic;
+    --out
+    wdata      : out std_logic_vector(7 downto 0);
+    wr_en      : in  std_logic;
+    wr         : out std_logic
+    );
+end;
+
+architecture Behavioral of capitalisation is
+
+ 
+
+begin
+
+
+  process(clk)
+  begin
+      wr<='0';
+      rd<='0';
+      if wr_en='1' and rd_en ='1' then
+         wr<='1';
+         rd<='1';
+        if (unsigned(rdata)>X"60") and 
+           (unsigned(rdata)<X"7B") then
+             wdata<=rdata(7 downto 6 )&'0'& rdata(4 downto 0);
+        else
+          wdata<=rdata;
+        end if;
+      end if;
+      if reset='1' then
+        wr<='0';
+      end if;              
+  end process;
+
+ 
+
+end Behavioral;
+