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Commit | Line | Data |
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1 | ; DRAM refresh | |
2 | ; | |
3 | ; Copyright (C) 2010 Sprite_tm | |
4 | ; Copyright (C) 2010 Leo C. | |
5 | ; | |
6 | ; This file is part of avrcpm. | |
7 | ; | |
8 | ; avrcpm is free software: you can redistribute it and/or modify it | |
9 | ; under the terms of the GNU General Public License as published by | |
10 | ; the Free Software Foundation, either version 3 of the License, or | |
11 | ; (at your option) any later version. | |
12 | ; | |
13 | ; avrcpm is distributed in the hope that it will be useful, | |
14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | ; GNU General Public License for more details. | |
17 | ; | |
18 | ; You should have received a copy of the GNU General Public License | |
19 | ; along with avrcpm. If not, see <http://www.gnu.org/licenses/>. | |
20 | ; | |
21 | ; $Id$ | |
22 | ; | |
23 | ||
24 | ||
25 | ; ------------------- DRAM Refresh Interrupt -------------------- | |
26 | ||
27 | .cseg | |
28 | ||
29 | INTERRUPT OC2Aaddr | |
30 | ||
31 | sbis P_RAS,ram_ras ;2 | |
32 | reti | |
33 | ; CAS RAS | |
34 | cbi P_CAS,ram_cas ;2 1| 1| | |
35 | ; 1| 1| | |
36 | cbi P_RAS,ram_ras ;2 |0 1| | |
37 | ; |0 1| | |
38 | nop ;1 |0 |0 | |
39 | ; nop ;1 |0 |0 | |
40 | sbi P_RAS,ram_ras ;2 |0 |0 | |
41 | ; |0 |0 | |
42 | dram_wait DRAM_WAITSTATES-1 ; | | | |
43 | ; nop ;1 |0 |0 | |
44 | cbi P_RAS,ram_ras ;2 |0 1| | |
45 | ; |0 1| | |
46 | sbi P_CAS,ram_cas ;2 |0 |0 | |
47 | ; |0 |0 | |
48 | sbi P_RAS,ram_ras ;2 1| |0 | |
49 | ; 1| 1| | |
50 | reti ;4 --> 21 cycles | |
51 | ||
52 | ||
53 | ; vim:set ts=8 noet nowrap | |
54 |