| ??? 12/13/05 14:06 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#105140 - Not exactly... Responding to: ???'s previous message |
Sarang said:
Jeff had already said how can there be an output if Xtal1 and Xtal2 are input pins. You both are wrong: XTAL2 is an output! So by putting capacitor in your circuit, you formed resonant network! No, that's not the reason for the need of additional caps. Even the small input stray capacitance at XTAL1 pin would allow it to resonate. The two caps, which are called burden caps by the way, are needed to achieve proper phase shift for the pierce oscillator and to keep the signal at XTAL1 input in the correct range. This cannot be provided by the small stray capacitance alone. Kai |
| Topic | Author | Date |
| 89lpc952 18MHz crystal | 01/01/70 00:00 | |
| hrm | 01/01/70 00:00 | |
| Re:hrm | 01/01/70 00:00 | |
| Is it capacitor or crystal...? | 01/01/70 00:00 | |
| Not exactly... | 01/01/70 00:00 | |
| exactly | 01/01/70 00:00 | |
Might be also useful | 01/01/70 00:00 |