| ??? 07/27/05 12:43 Read: times |
#98267 - Re: Expand your 8051 memory Responding to: ???'s previous message |
It's not that easy. When a MOVC is used in the application then the data fetched must not be 'translated' into an LJMP/LCALL opcode, it must be unchanged. How do we know this? The 8051 has no signal that the first opcode byte of an instruction is fetched, therefore that external hardware must implement an opcode-decoder to know what is going on. This opcode-decoder however, requires knowledge of the 8051 chip used, because the instruction execution behaviour, the clock cycles used, may be different to the standard intel 8051 core, and in many modern 8051 cores really are different. The article about memory expanding looks pretty nice, but as stated above, it's not that easy. Best regards, J. Christoph |
| Topic | Author | Date |
| "Expand your 8051 memory" | 01/01/70 00:00 | |
| Nice technique used | 01/01/70 00:00 | |
| tour de force | 01/01/70 00:00 | |
Not necessarily... | 01/01/70 00:00 | |
| reinventing a square wheel | 01/01/70 00:00 | |
| Re: Expand your 8051 memory | 01/01/70 00:00 | |
| Hmmm | 01/01/70 00:00 | |
| Pranav! | 01/01/70 00:00 | |
| Very nice dream | 01/01/70 00:00 | |
| Seems kind of pointless | 01/01/70 00:00 | |
| Only a mental exercise | 01/01/70 00:00 |