| ??? 09/13/05 12:14 Read: times Msg Score: +1 +1 Informative |
#100997 - Atmel's bad informing (again) |
I'd like to share my new experience with the members of the Forum.
I've been using AT89S8252 and ...53 a long time. I made myself the Programmer for them, where both HW and SW are my work. There have never been problems with either programming or reading of these processors. As these two should be soon exchanged with AT89S8253, which has the capacities of the both previous, I've started with adapting my program for programming the new one. (I must mention here that I was pleasantly surprised by the price of AT89S8253). I expected that it will be easy to make all necessary changes. But the programming failed every time. I checked all the timings and even all sent bytes (on a Tektronix scope), all seemed to be OK, but no result! For two days I was only looking for the reason of failure. At last I saw that data should be sampled on negative edge of the clock (see page 44 of AT89S8253 datasheet), while those "fully compatible" ...8252/...53 took data on positive edge (page 25 of AT89S8252)! The whole problem was in that! And not a single word about that in their "Migrating from ...S8252/S53 to ...S8253" ! Regards, Slobodan Mandaric |
| Topic | Author | Date |
| Atmel's bad informing (again) | 01/01/70 00:00 | |
| Informative Post. | 01/01/70 00:00 | |
| Errata | 01/01/70 00:00 | |
Latest news on bugs in 8253 | 01/01/70 00:00 | |
| Thanks & Congrat's making Programmer | 01/01/70 00:00 | |
| AT89S8252 programmer | 01/01/70 00:00 | |
| AT89S8252 programmer | 01/01/70 00:00 | |
| good point | 01/01/70 00:00 | |
| Datasheets | 01/01/70 00:00 | |
| I'm puzzled | 01/01/70 00:00 | |
| ISP programmer | 01/01/70 00:00 | |
| I thought ... | 01/01/70 00:00 | |
| Of course, but is this a "programmer" ? | 01/01/70 00:00 | |
| ISP | 01/01/70 00:00 | |
| I see the basic difference between a "tr | 01/01/70 00:00 | |
| Differences between ISP | 01/01/70 00:00 | |
| Timing critical SPI, well I'll be | 01/01/70 00:00 | |
| New user needs help | 01/01/70 00:00 | |
| what program, it'can't be the ISP interf | 01/01/70 00:00 | |
| please clarify | 01/01/70 00:00 | |
| ISP!? | 01/01/70 00:00 |