| ??? 04/12/06 05:58 Read: times |
#114133 - AT89S8252 Responding to: ???'s previous message |
hi,
Oleg Sergeev said:
- some derivatives do not allow to use MOVX with @Ri; Jan Waclawek said:
Wow, which one dares?
AT89S8252 Primer says at page 2: EEPROM EEPROM and external data memory are accessible by indirect addressing only, utilizing the MOVX instructions, which come in two flavors: 8-bit and 16-bit. Only the 16-bit MOVX instructions (those utilizing DPTR) may be used to access internal EEPROM. The 2K bytes of EEPROM are accessed at addresses 000H-7FFH. Probably AT89S8253 does the same way. Regards, Oleg |
| Topic | Author | Date |
| unclarity with movx instruction | 01/01/70 00:00 | |
| Speed up | 01/01/70 00:00 | |
| Mistake | 01/01/70 00:00 | |
| Clarity prevails! | 01/01/70 00:00 | |
| Quicker? | 01/01/70 00:00 | |
| Quicker! | 01/01/70 00:00 | |
| assumption... | 01/01/70 00:00 | |
| Finally, you are right! | 01/01/70 00:00 | |
| MOVX @Ri | 01/01/70 00:00 | |
| since you did not have the time to find | 01/01/70 00:00 | |
| wrong answer | 01/01/70 00:00 | |
| Typo | 01/01/70 00:00 | |
| thanks Erik for the correction | 01/01/70 00:00 | |
| It is set to P0 | 01/01/70 00:00 | |
| wrong again | 01/01/70 00:00 | |
| Yes I am | 01/01/70 00:00 | |
| an example | 01/01/70 00:00 | |
| Internal XRAM | 01/01/70 00:00 | |
| not really | 01/01/70 00:00 | |
| Ports' SFR are set to 1 | 01/01/70 00:00 | |
not a port, a "page SFR" | 01/01/70 00:00 | |
| P2? | 01/01/70 00:00 | |
| Doh! | 01/01/70 00:00 | |
| which derivative | 01/01/70 00:00 | |
| do not allow? | 01/01/70 00:00 | |
| AT89S8252 | 01/01/70 00:00 | |
| Aaaaah, so. Thanks. | 01/01/70 00:00 | |
| Tanks | 01/01/70 00:00 |