ABSTRACT.TXT

This directory contains an I/O library for the MCB251 target board.  The
I/O library can be used to perform serial communication via the external
serial device of the MCB251 board.  The MCB251 library contains several
functions which are described below.  The I/O routines work with XON/XOFF
protocol and can be directly linked together with C251 applictions.


The library is available in three versions:
MCB251IO.LIB   for MCB251 board version 1  (with Intel 251 A-step device)
MCB251V2.LIB   for MCB251 board version 2  (for Intel 251 C-step and Temic)
Note: MCB251IO.LIB & MCB251V2.LIB uses parameter passing for C251 Version 1 

MCB251C2.LIB   for MCB251 board version 2  (for Intel 251 C-step and Temic)
Note: MCB251C2 uses parameter passing for C251 Version 2




Function               Description
--------------------------------------------------------------------------
char _getkey (void)    C function _getkey which accesses the external SIO
                       device.

char putchar (char)   C function putchar which accesses the external SIO
                      device.

bit instat (void)     checks if a character is available in the input buffer
                      of the external SIO device.  If instat returns 0 no
                      character is available.  If instat returns 1 a character
                      can be read via the function _getkey.  The instat
                      function is identical with checking the bit RI of the
                      8051 serial interface.

void XSIOinit (void)  initializes the external SIO interface for 8 bits,
                      1 stop bit, no parity.  The baudrate can be defined
                      within the source file XSIOINIT.A51.  The default
                      baudrate is 57600 Baud (bps).