| ??? 06/09/11 18:12 Read: times |
#182561 - Experimentation ;) Responding to: ???'s previous message |
I'm aware of the limitations of using the same code for XDATA and CODE. What I was thinking of doing is using the 8kb internal flash as a lower ROM, where I will assemble my external programs using ORG $2000, and then using $0000-1FFF as 8KB of XDATA, which should be plenty for what I'm doing. Since I'm using SDCC as my C compiler, I think it lets me specify using a linker script where my XDATA can go and where my CODE can go.
Also, it opens up very interesting possibilities of self-modifying code, although that's probably not very useful at all on an 8051 architecture. |
| Topic | Author | Date |
| Bootloading using external RAM and EA switching? | 01/01/70 00:00 | |
| Not sufficient! | 01/01/70 00:00 | |
| Use single SRAM chip by tying PSEN to RD? | 01/01/70 00:00 | |
| That qualifies as... | 01/01/70 00:00 | |
| Experimentation ;) | 01/01/70 00:00 | |
| No need for experimentation | 01/01/70 00:00 | |
| Fast-forward to 2010 or thereabouts | 01/01/70 00:00 | |
| It would be a pretty narrow window, but ... | 01/01/70 00:00 | |
| methinks the real reason | 01/01/70 00:00 | |
| That's true for program updates, but ... | 01/01/70 00:00 | |
| visualizing any case where the regular ISP/IAP is too slow | 01/01/70 00:00 | |
| ... and FRAM's pretty fast, too ... | 01/01/70 00:00 | |
Would have liked to have used FRAM... | 01/01/70 00:00 | |
| As long as intervening RESET | 01/01/70 00:00 | |
| do You need EA controlled? | 01/01/70 00:00 | |
| hmm | 01/01/70 00:00 | |
| not surprised | 01/01/70 00:00 | |
| Decided not to use EA (rather, shouldn't) | 01/01/70 00:00 | |
| i'm confused by AT89S52 | 01/01/70 00:00 | |
| This is the page I found | 01/01/70 00:00 | |
| great | 01/01/70 00:00 |