| ??? 09/28/05 14:18 Read: times |
#101666 - external vs internal XRAM Responding to: ???'s previous message |
Jon Ledbetter said:
[...] seems the ones that I've worked with, still access XRAM the same way, whether it's on the chip or not. Does there need to be a defined difference or just a mention that it could be included internally within some chips? The differences are, for example: - some of the faster derivatives are able to insert waitstates while accessing the external XRAM(XROM); of course they don't do that while accessing the internal XRAM - using MOVX @Rn on RD2's (and maybe others) accesses only the bottom 256 bytes of internal XRAM, while with external XRAM it can access any address, within a page with high byte of address given by P2 (that's what Andy called PDATA) Jan Waclawek |
| Topic | Author | Date |
| glossary | 01/01/70 00:00 | |
| Dunno, but... | 01/01/70 00:00 | |
| glossary | 01/01/70 00:00 | |
| "external" | 01/01/70 00:00 | |
| explain | 01/01/70 00:00 | |
| indirect? | 01/01/70 00:00 | |
| Flash | 01/01/70 00:00 | |
| XRAM | 01/01/70 00:00 | |
| X? | 01/01/70 00:00 | |
| XRAM | 01/01/70 00:00 | |
| MOVX is the key | 01/01/70 00:00 | |
| access | 01/01/70 00:00 | |
| Sort of | 01/01/70 00:00 | |
| wikish | 01/01/70 00:00 | |
| memory types and datatypes | 01/01/70 00:00 | |
| precise | 01/01/70 00:00 | |
| maybe like this | 01/01/70 00:00 | |
| XDATA | 01/01/70 00:00 | |
| re: XDATA | 01/01/70 00:00 | |
| update | 01/01/70 00:00 | |
| why? does anyone ever look there | 01/01/70 00:00 | |
| We don't understand each other | 01/01/70 00:00 | |
| My understanding of the wiki was that it | 01/01/70 00:00 | |
| wicked | 01/01/70 00:00 | |
| re chip directories | 01/01/70 00:00 | |
| Hang on | 01/01/70 00:00 | |
| sorry | 01/01/70 00:00 | |
| Nope | 01/01/70 00:00 | |
Congrats Steve. | 01/01/70 00:00 | |
| stack =? IDATA | 01/01/70 00:00 | |
| PDATA??? | 01/01/70 00:00 | |
| PDATA | 01/01/70 00:00 | |
| That's the crux | 01/01/70 00:00 | |
| internal external | 01/01/70 00:00 | |
| Is there is difference in... | 01/01/70 00:00 | |
| external vs internal XRAM | 01/01/70 00:00 | |
| or other sfr | 01/01/70 00:00 | |
| ERAM | 01/01/70 00:00 | |
| Wiki Wiki | 01/01/70 00:00 | |
| glossary on wiki | 01/01/70 00:00 |