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 portoutw()          Write a word to an I/O port
------------------------------------------------------------------------------
 Declaration
   system.hdr

 Syntax
   proc portoutw extern
   param value uint uPortAddress, ;
         value uint uPortData

 Arguments
   uPortAddress is an output port number.
   uPortData is the word to be output.

 Return
   None.

 Description
   The portoutw() procedure writes the data word passed in uPortData to the
   specified I/O port.

   Incorrect use of this function may cause unpredictable results or loss of
   data.

 Example
   #define EXAMPLE_SYSTEM
   #include example.hdr

   proc Test_portoutw
   vardef
      uint uPort
      uint uWord
   enddef
   uPort := 0x0                         // serial port 1
   uWord := 'C'
   portoutw( uPort, uWord )
   ? "Word written to port", istr( uPort ), "is", istr( uWord )
   endproc

   proc main
   Test_portoutw()
   endproc