Dear community,

this morning I compiled a register definition file for the Oki devices MSM80C154S and MSM83C154S for use with the marvellous free SDCC compiler.
According to Google no such file has been published yet.

/*-------------------------------------------------------------------------
   Register Declarations for the Oki MSM80C154S and MSM83C154S
   
   Written By -  Matthias Arndt / marndt@asmsoftware.de (July 2005)

   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 2, or (at your option) any
   later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

   In other words, you are welcome to use, share and improve this program.
   You are forbidden to forbid anyone else to use, share and improve
   what you give them.   Help stamp out software-hoarding!
-------------------------------------------------------------------------*/
 
#ifndef REG8xC154S_H
#define REG8xC154S_H

#include <8052.h>     /* load definitions for the 8052 core */

#ifdef REG8052_H
#undef REG8052_H
#endif

/* byte SFRs */
sfr at 0xf8 	IOCON;	/* IOCON register */

/* bit locations */
sbit at 0xf8	ALF;	/* floating status on power down control */
sbit at 0xf9	P1HZ;	/* P1 high impedance input control */
sbit at 0xfa	P2HZ;	/* P2 high impedance input control */
sbit at 0xfb	P3HZ;	/* P3 high impedance input control */
sbit at 0xfc	IZC;	/* 10kO pull-up resistor control */
sbit at 0xfd	SERR;	/* Serial port reception flag */
sbit at 0xfe	T32;	/* interconnect T0 and T1 to 32bit timer/counter */

#endif

Under Linux, install it under $BASEDIR/sdcc/include, basically where SDCC already stores its 8051.h and 8052.h include files.
Same should apply for other SDCC installations.

I agree that one hardly needs the IOCON register and all other registers are 8052 compatible anyway so this was mainly a toy for myself.

Anyway I hope this helps and perhaps it is even useful for someone out there.

cheers,
Matthias