| ??? 12/13/05 09:26 Read: times |
#105127 - Is it capacitor or crystal...? Responding to: ???'s previous message |
Shruthi Kumar said:
I was referring to the 18 MHz waveform at these pins.Anyway I have achieved it by using 22pF by-pass capacitors for the crystal.Thanks for your reply. What does that mean? You achieved 18Mhz signal by using 22pf capacitor??? Jeff had already said how can there be an output if Xtal1 and Xtal2 are input pins. The input Xtal1 and Xtal2 are used to give a clock to uC so as to work synchronously. Now that the capacitors are required alongwith a crystal to form resonant network. Here the purpose of capacitor is not to bipass anything but to form an oscillator circuit. The output is because of crystal, capacitor and on-chip inverter not because of the 22pf capacitor only. You can connect any capacitor between 22 to 33pf range. from each pin of crystal to ground. Shruthi Kumar said:
I have achieved it by using 22pF by-pass capacitors for the crystal.Thanks for your reply. So by putting capacitor in your circuit, you formed resonant network! Regards Sarang |
| 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 |