| ??? 05/03/06 11:36 Read: times |
#115446 - think of it like a clock Responding to: ???'s previous message |
Andy Neil said:
The assumption being, of course, that Cyrille is actually talking about an 8051 instruction... Sticking with that assumption, think of it like a good, old-fashioned analogue clock: If you wind an analogue clock back to 00:00 (or 12:00, if you prefer), and then wind it back (ie, dcrement it) by another minute, you will end up at 23:59 (or 11:59). Similarly decrementing a byte value of 0x00 will usually give you a byte value of 0xFF. If you think of 0xFF as a 2's complement number, then it's -1 - which is exactly what you'd expect after subtracting one from zero! It all makes sense, really... |
| Topic | Author | Date |
| DEC 0H ? | 01/01/70 00:00 | |
| dec | 01/01/70 00:00 | |
| How you figure its memory location zero? | 01/01/70 00:00 | |
| Because | 01/01/70 00:00 | |
| assumption... | 01/01/70 00:00 | |
| think of it like a clock | 01/01/70 00:00 | |
| i think it's bible time | 01/01/70 00:00 | |
| ASSUME = ASS U ME read and head. | 01/01/70 00:00 | |
| but the answer will still be in "the bib | 01/01/70 00:00 | |
| It's in the title! | 01/01/70 00:00 | |
| rely on history | 01/01/70 00:00 | |
| exceptions? | 01/01/70 00:00 | |
| not exactly that ... | 01/01/70 00:00 | |
| DEC R6 ! (8051 chip) | 01/01/70 00:00 | |
| the description of the DEC instruction | 01/01/70 00:00 | |
| Good! Erick | 01/01/70 00:00 | |
| why work from print | 01/01/70 00:00 | |
| I do ! | 01/01/70 00:00 | |
| Surely that's justification enough. | 01/01/70 00:00 | |
| I did not suggest that | 01/01/70 00:00 | |
I did not suggest that ! .... | 01/01/70 00:00 | |
| Think about an ordometer | 01/01/70 00:00 | |
| control apps | 01/01/70 00:00 | |
| In decimal mode ... | 01/01/70 00:00 |