| ??? 05/07/05 07:03 Read: times |
#93155 - read Atmel Responding to: ???'s previous message |
hin
Vijayganesh S said:
i have atmel 89c51 based controller. from the datasheet, the crystal circuit capacitor is given as 30pf+/-10%. i put 33pf. but i am getting only 8MHz for 24MHz crystal between XTAL1 & GND. and between XTAL1 & XTAL2 i am getting only 50Hz.
help me, what mistake i have done in this circuit. Atmel has published some notes about crystal usage: Analyzing the Behavior of an Oscillator and Ensuring Good Start-up How to use a Third Overtone Crystal with a 80C51 Family Hope that does explain the solutions. Regards, Oleg |
| Topic | Author | Date |
| crystal problem - 89c51 | 01/01/70 00:00 | |
| ALE | 01/01/70 00:00 | |
| Maybe... | 01/01/70 00:00 | |
| two capacitors or one?? | 01/01/70 00:00 | |
| milli? | 01/01/70 00:00 | |
| read Atmel | 01/01/70 00:00 | |
| Use XTAL2 pin for freq. measurment | 01/01/70 00:00 | |
| Better use 22MHz fundamental + two 27pF | 01/01/70 00:00 | |
| tried for low capacitance | 01/01/70 00:00 | |
| bible time | 01/01/70 00:00 | |
This should help | 01/01/70 00:00 |