| ??? 05/06/10 23:30 Read: times |
#175765 - Why not having a look into the datasheet? Responding to: ???'s previous message |
Page 33 in here:
http://www.atmel.com/dyn/resou...oc3286.pdf This is a rather strange Pierce oscillator, isn't it? Replacing a burden cap by a high ohmic resistor at high frequencies?? To provide what?? I suspect it's the parasitic inductance of the high impedance resistor that shall make this darn thing work? But such parasitics are highly unpredicable, if no special brand is recommended. What a nonsense!! The oscillator of the AT89S8253 is "unique", like some other "issues" of the AT89S8253, but not at all common to the Pierce oscillator design Atmel uses in the other micros. If so, I wouldn't use Atmel's micros any longer. Kai Klaas |
| Topic | Author | Date |
| Capacitor Value of MCS51 for Crystal | 01/01/70 00:00 | |
| What frequency? Fundamental or overtone? | 01/01/70 00:00 | |
| Reply to Kai Klass | 01/01/70 00:00 | |
| Equivalent series resistance is the critical parameter | 01/01/70 00:00 | |
| WHY? | 01/01/70 00:00 | |
| Of course!! | 01/01/70 00:00 | |
| Thanks to Erik, Kai and others | 01/01/70 00:00 | |
| Presumably because | 01/01/70 00:00 | |
| Oscillator frequency. | 01/01/70 00:00 | |
| Why not having a look into the datasheet? | 01/01/70 00:00 | |
| Thanks David Prentice | 01/01/70 00:00 | |
Your setup should include the micro... | 01/01/70 00:00 | |
| i had this problem before | 01/01/70 00:00 | |
| Reply to Arun Kumar | 01/01/70 00:00 | |
| may be this will help | 01/01/70 00:00 | |
| not necessarily | 01/01/70 00:00 | |
| Thanks Arun Kumar | 01/01/70 00:00 | |
| danger, danger | 01/01/70 00:00 | |
| Only the AT89S8253 is problematic! | 01/01/70 00:00 | |
| clarification appreciated | 01/01/70 00:00 | |
| I only recall the ones... | 01/01/70 00:00 | |
| with no interest ... | 01/01/70 00:00 | |
| Erik, you hurt me... | 01/01/70 00:00 | |
| no hurt intended | 01/01/70 00:00 |