| ??? 12/03/04 18:21 Read: times |
#82482 - Different jmps Responding to: ???'s previous message |
A small routine with sjmp can be placed over a 2K border without problem, as long as the jumps are within 128.
Some assemblers can take care of the problem for you, you use JMP and the assembler insert the "best" jump instruction, it has some advantages when the code grows, part of the code goes over to next page and you have to change AJMP to LJMP. Beware of jump tables which must use a known JUMP, because LJMP takes 3 bytes. Anders |
| Topic | Author | Date |
| sjmp vs ajmp | 01/01/70 00:00 | |
| as you said | 01/01/70 00:00 | |
| Different jmps | 01/01/70 00:00 | |
| re:AJMP, SJMP | 01/01/70 00:00 | |
| AJMP is 2 bytes LJMP is 3 | 01/01/70 00:00 | |
| LJMP was not the question | 01/01/70 00:00 | |
| AJMP vs SJMP | 01/01/70 00:00 | |
| Relocable. | 01/01/70 00:00 | |
| relocatable | 01/01/70 00:00 | |
| Re:Relocatable | 01/01/70 00:00 | |
| relocatable - not in a 51 | 01/01/70 00:00 | |
| Relocatable Code is Valid | 01/01/70 00:00 | |
| Not JMPs, relocatable | 01/01/70 00:00 | |
| I can anticipate all kinds of situations | 01/01/70 00:00 | |
| If I can devise concepts others will too | 01/01/70 00:00 | |
| "driver". | 01/01/70 00:00 | |
| Re: driver | 01/01/70 00:00 | |
maybe... maybe not. | 01/01/70 00:00 | |
| 16M derivatives... | 01/01/70 00:00 | |
| SJMP is 2 bytes | 01/01/70 00:00 | |
| Maybe he means additional bytes | 01/01/70 00:00 | |
| yes. | 01/01/70 00:00 |