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/*  timer_isr()

 *

 *  This routine provides the ISR for the Z8536 timer on the DMV152

 *  board.   The timer is set up to generate an interrupt at maximum

 *  intervals.

 *

 *  Input parameters:  NONE

 *

 *  Output parameters:  NONE

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  $Id: timerisr.S,v 1.2 2001-09-27 12:00:01 chris Exp $

 */

#include "asm.h"

BEGIN_CODE

.set TIMER,           0x0c000007         | port A

.set CT1_CMD_STATUS,  0x0a               | command status register

.set RELOAD,          0x26               | clr IP & IUS,allow countdown

        PUBLIC(timerisr)

SYM (timerisr):

        movb    #CT1_CMD_STATUS,TIMER    | set pointer to cmd status reg

        movb    #RELOAD,TIMER            | reload countdown

        addql   #1, SYM (Ttimer_val)     | increment timer value

        rte

END_CODE

END