| ??? 09/14/05 07:00 Read: times |
#101026 - good point Responding to: ???'s previous message |
hi,
Slobodan Mandaric said:
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)!
And not a single word about that in their "Migrating from ...S8252/S53 to ...S8253" ! I agree that they should drop a note about this difference into Migrating datasheet. As for now they said only "Users of third-party programmers should download the AT89S8253 driver for their particular programmer." Anyway when somebody have read such notification then he should think that something has been changed with it, do you? From other side, datasheet of AT89S8253 shows these differences cleanly. First of all, Atmel specially indicates that they use SPI Mode 1 for serial downloading. And Table 28-1 "Serial Programming Characteristics" shows parameter "MOSI Setup to SCK Low" while AT89S8252 uses opposite one "MOSI Setup to SCK High". Indeed, most times Atmel forget important things to be indicated but careful reading of datasheets may help somehow. Regards, Oleg |
| 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 |