| ??? 02/14/09 16:12 Read: times |
#162415 - Combine CJNE with JC/JNC instruction... Responding to: ???'s previous message |
... as explained at the top of page 23 of the instruction set:
http://www.nxp.com/acrobat_d...UIDE_1.pdf Remember, when the 8052 executes the CJNE instruction, the carry flag is affected in the same way, as if the micro would perform the substraction "<dest-byte> - <src-byte>" and the carry flag would indicate whether a "borrow" was needed to do this. So, if <dest-byte> >= <src-byte>, the carry clag is "0", and vice versa. Another way is to use the SUBB instruction followed by the JC/JNC instruction. By this you can easily perform multi byte comparisons, for instance. Don't forget to use the CLR C instruction before executing the first SUBB instruction, as explained at the top of page 52 of same instruction set. Kai |
| Topic | Author | Date |
| mathimatical question using 8052 | 01/01/70 00:00 | |
| CJNE? | 01/01/70 00:00 | |
| problem in "" < "" and "" > "" | 01/01/70 00:00 | |
| Reading is fundamental | 01/01/70 00:00 | |
| *Careful* and *Thorough* reading is key | 01/01/70 00:00 | |
| "bible" link(s) | 01/01/70 00:00 | |
| Combine CJNE with JC/JNC instruction... | 01/01/70 00:00 | |
| Thanks Kai the PDF was so helpfull | 01/01/70 00:00 | |
| You can use.. | 01/01/70 00:00 | |
maybe use a compiler | 01/01/70 00:00 |