| ??? 03/24/07 14:30 Read: times |
#135783 - I had the same problem Responding to: ???'s previous message |
Hi Alex.
I suffer of the same problem updating from 8252 to 8253. According to my experience: - use no caps (datasheet says 5+/-5pF - use 0pF) - put 1M from X1 to ground - most important: be sure that Vcc rise time is low (<5mS) You can see http://www.8052.com/forum/read.phtml?id=132322 for some discusion about AT89S8253. Good luck Daniel |
| Topic | Author | Date |
| AT89S8253 clocking problem | 01/01/70 00:00 | |
| The scope probe is the clue!! | 01/01/70 00:00 | |
| The tale of a 1000 fingers | 01/01/70 00:00 | |
| Alex did what the datasheet demands | 01/01/70 00:00 | |
| 1M across cap | 01/01/70 00:00 | |
| are you sure it is not 1/3? | 01/01/70 00:00 | |
| I had the same problem | 01/01/70 00:00 | |
| Works!! But is it a solution | 01/01/70 00:00 | |
| is it 1/4 or 1/3 | 01/01/70 00:00 | |
| Speed unstable | 01/01/70 00:00 | |
| May be clock amplitude... | 01/01/70 00:00 | |
| Crystal frequency | 01/01/70 00:00 | |
| An interesting article... | 01/01/70 00:00 | |
| Use an external oscillator! | 01/01/70 00:00 | |
wait a year or more for the errata | 01/01/70 00:00 |