4.104.114.84.95
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1 | # timer_isr() |
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2 | # |
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3 | # This routine provides the ISR for the Z8036 timer on the MVME136 |
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4 | # board. The timer is set up to generate an interrupt at maximum |
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5 | # intervals. |
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6 | # |
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7 | # Input parameters: NONE |
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8 | # |
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9 | # Output parameters: NONE |
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10 | # |
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11 | # COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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12 | # On-Line Applications Research Corporation (OAR). |
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13 | # All rights assigned to U.S. Government, 1994. |
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14 | # |
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15 | # This material may be reproduced by or for the U.S. Government pursuant |
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16 | # to the copyright license under the clause at DFARS 252.227-7013. This |
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17 | # notice must appear in all copies of this file and its derivatives. |
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18 | # |
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19 | # $Id$ |
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20 | # |
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21 | |
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22 | #include "asm.h" |
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23 | |
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24 | BEGIN_CODE |
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25 | |
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26 | .set CT1_CMD_STATUS, 0xfffb000a | port A |
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27 | .set RELOAD, 0x24 | clr IP & IUS,allow countdown |
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28 | |
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29 | PUBLIC (timerisr) |
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30 | SYM (timerisr): |
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31 | movl a0,a7@- | save a0 |
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32 | movl #CT1_CMD_STATUS,a0 | a0 = addr of cmd status reg |
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33 | movb #RELOAD,a0@ | reload countdown |
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34 | addql #1, SYM (Ttimer_val) | increment timer value |
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35 | movl a7@+,a0 | save a0 |
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36 | rte |
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37 | |
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38 | END_CODE |
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39 | END |
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