Pic 18f4431 Oscillator Problem - Electronic Circuits Projects Diagrams Free

2exposantThom · 30th October 2008, 04:32 PM

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

**Nigel Goodwin** · 30th October 2008, 05:17 PM

Quote:

Originally Posted by 2exposantThom

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

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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30th October 2008, 04:32 PM	#1
2exposantThom	Pic 18f4431 Oscillator Problem 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