| ??? 01/01/13 19:58 Read: times |
#189057 - Check Atmel for 'migrating' docs Responding to: ???'s previous message |
Steph Ru said:
I have been prototyping with an 80C31 and it seems to run fine. I got a hold of some AT89C51RC and AT89C51RC2 devices from Atmel (larger on-chip FLASH and ERAM). I know that the RC2 device has some boot ROM addressing setup required as well 1 or 2 other features which makes it different from the standard 80C51.
The 80C31 is external code, but the AT89C are internal flash ? Are you running them from internal or external code ? As Erik has mentioned, you can sometimes hit a x2 issue - if it is easy to do, dropping the Xtal speed can check if your Display cannot keep up. There is also an EXTRAM bit that can need attention. To muddy things a little more, I would suggest instead looking at the AT89LP51RC2, (/RD2/ID2/ED2/RB2 etc ) These are faster cores, with ADC and similar boot loaders, and are now in stock at Digikey. (& generally cheaper) The AT89LP51 data sheets are also better written & organised. Also check Atmel website for 'migrating' docs, they have a lot of those eg The Atmel Migration doc (3716A) I have here, covers Migrating from AT89C51RB2/RC2/RD2/ED2/IC2/ID2 to AT89LP51RB2/RC2/RD2/ED2/IC2/ID2 |
| Topic | Author | Date |
| 80C52 vs. AT89C51RC vs. AT89C51RC2 | 01/01/70 00:00 | |
| pointers to check in the datasheets | 01/01/70 00:00 | |
| Check Atmel for 'migrating' docs | 01/01/70 00:00 | |
| 80C52 vs. AT89C51RC vs. AT89C51RC2 | 01/01/70 00:00 | |
Try a sanity check pin toggle  | 01/01/70 00:00 |