projects / avrcpm.git / blame
| Commit | Line | Data |
|---|---|---|
| bd5af9a5 L |
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 | ; | |
| 4f466098 | 21 | ; $Id$ |
| bd5af9a5 L |
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 |