| ??? 09/30/05 20:17 Read: times |
#101797 - it depends Responding to: ???'s previous message |
It depends how the /OE signal of EEPROM (28Cxx?) is connected. If to /PSEN only, the locked ED2 has no means to read it. If to /PSEN AND /RD, you can read it using MOVX A,@DPTR (note that by default there is an internal RAM (ERAM) mapped at the first 768 bytes of MOVX-accessed space). Jan Waclawek |
| Topic | Author | Date |
| AT89C51ED2 and external EEPROM | 01/01/70 00:00 | |
| If serial, try a write and a read, if pa | 01/01/70 00:00 | |
| some comments | 01/01/70 00:00 | |
| why "of course" most is serial | 01/01/70 00:00 | |
| I don't need 128K programm memory | 01/01/70 00:00 | |
| if it is not used, you can not detect it | 01/01/70 00:00 | |
| I must to do it by software | 01/01/70 00:00 | |
| You should have thought of that before y | 01/01/70 00:00 | |
| Re: hardware required | 01/01/70 00:00 | |
| leave harvard structure! | 01/01/70 00:00 | |
| it depends | 01/01/70 00:00 | |
| no meaning | 01/01/70 00:00 | |
| Software solution | 01/01/70 00:00 | |
| Sure, but why? | 01/01/70 00:00 | |
| Ask Sebastian | 01/01/70 00:00 | |
| Please explain further | 01/01/70 00:00 | |
| some explayning | 01/01/70 00:00 | |
| Use other device | 01/01/70 00:00 | |
XDATA? | 01/01/70 00:00 |