Pic 18f4431 Oscillator Problem

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2exposantThom

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Hello, I'm trying to configure a PIC18F4431 using an external oscillator
However, when I scope the OSC1 and OSC2 pins, the signals are sticked to 5V ....
The oscillator used seems to be the internal one.

Someone could help me ??

thanks
 
2exposantThom said:
Hello, I'm trying to configure a PIC18F4431 using an external oscillator
However, when I scope the OSC1 and OSC2 pins, the signals are sticked to 5V ....
The oscillator used seems to be the internal one.

Someone could help me ??

thanks
Click to expand...

In which case you've not set the config fuses correctly, check the datasheet for how they should be set.

Presumably you're using a x10 probe when scoping the oscillator pins?, using a x1 probe commonly stops the oscillator running.
 
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