| ??? 07/19/05 10:58 Read: times |
#97616 - Also according to the datasheet: Responding to: ???'s previous message |
"When the EA pin is high, the processor fetches instructions from internal program Flash. If the EA pin is tied low, all program memory fetches are from external memory."
For which I see no exception being mentioned, which implies that this is ALWAYS the case if you tie /EA low. Period. It MAY mean that if you tie /EA low and set LB2, the CPU can't access either program memory and fetches only latch noise, but that's just guessing. I think Sebastian's best option is to let the /EA pin stick out and to connect it to Vcc with a little wire. Such modifications are not uncommon, and here is why. |
| Topic | Author | Date |
| Migration on AT89C51ED2 problem | 01/01/70 00:00 | |
| please | 01/01/70 00:00 | |
| more details, please | 01/01/70 00:00 | |
| More detail | 01/01/70 00:00 | |
| possible reasons | 01/01/70 00:00 | |
| LB2 and /EA | 01/01/70 00:00 | |
| acording datasheet | 01/01/70 00:00 | |
| Also according to the datasheet: | 01/01/70 00:00 | |
| what Atmel says | 01/01/70 00:00 | |
| ... and what does not say. | 01/01/70 00:00 | |
| pull the blasted !EA and come back to re | 01/01/70 00:00 | |
| That Atmel chip difference !!! | 01/01/70 00:00 | |
different manufacturer | 01/01/70 00:00 |