diff options
Diffstat (limited to 'c/src/lib/libbsp/m68k/dmv152/timer/timerisr.s')
| -rw-r--r-- | c/src/lib/libbsp/m68k/dmv152/timer/timerisr.s | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/m68k/dmv152/timer/timerisr.s b/c/src/lib/libbsp/m68k/dmv152/timer/timerisr.s new file mode 100644 index 0000000000..d7ec593c62 --- /dev/null +++ b/c/src/lib/libbsp/m68k/dmv152/timer/timerisr.s @@ -0,0 +1,38 @@ +/* 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, 1990, 1991, 1992, 1993, 1994. + * On-Line Applications Research Corporation (OAR). + * All rights assigned to U.S. Government, 1994. + * + * This material may be reproduced by or for the U.S. Government pursuant + * to the copyright license under the clause at DFARS 252.227-7013. This + * notice must appear in all copies of this file and its derivatives. + * + * $Id$ + */ + +#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 |