| ??? 12/23/04 09:33 Modified: 12/23/04 09:34 Read: times |
#83684 - Thanks Kai Responding to: ???'s previous message |
Kai Klaas said:
Ijaz said:
Are you sure that oscillator is not working... I had a look at this datasheet: http://focus.ti.com/lit/ds/symlink/tl16c550c.pdf Figure 23 shows that this chip seems to come only with a naked inverter, not internally having connected this obligatory linearizing resistor from input to output. Such an inverter would need an externally applied 'Rp'... Kai ...which presumably implies that the Philips chip does have that resistor (which, thanks to Charles' link I now know moves the output from the crystal into the linear range). That one is fairly easy to solve - I just need a resistor across the 2 uart pins. It's RX2 (from the above datasheet) that's the problem - that one will need track cuts. |
| Topic | Author | Date |
| A little O/T help with UART Crystal | 01/01/70 00:00 | |
| Rethink | 01/01/70 00:00 | |
| Using current limiting resistor? | 01/01/70 00:00 | |
| Track cuts x200 | 01/01/70 00:00 | |
| I see no way | 01/01/70 00:00 | |
| full chip numbers | 01/01/70 00:00 | |
| Rp is missing with TI's chip! | 01/01/70 00:00 | |
| Thanks Kai | 01/01/70 00:00 | |
| Linear operation | 01/01/70 00:00 | |
| Resolution - I think..... | 01/01/70 00:00 | |
| Part Numbers | 01/01/70 00:00 | |
| the resistor | 01/01/70 00:00 | |
Both: Limiting and phase shifting | 01/01/70 00:00 | |
| Crystal oscillator reference. | 01/01/70 00:00 | |
| Thanks. | 01/01/70 00:00 |