Author Topic: how to connect external crystal oscillator with p89lpc936?  (Read 2033 times)

sri

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how to connect external crystal oscillator with p89lpc936?
« on: March 01, 2014, 06:14:35 am »
Hello,
I have problem in programming with p89lpc936. The internal RC oscillator type of programs are programmed well, and working properly. But when I choose the external oscillator, problem occurs. In this manner I have lost 14 ICís.
 
herewith i have attached my problem detail.
The error message image also attach with it.

Please help to rectify my problem.

Andy Ayre

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Re: how to connect external crystal oscillator with p89lpc936?
« Reply #1 on: March 04, 2014, 12:57:27 am »
Please don't describe problems in attachments. The attachment is not searchable.

Put a scope on the XTAL pins - do you see sine waves? What frequency are they? Are they clean?

Put a scope on the RxD and TxD pins. Do you see the 'U' going in from Flash Magic and nothing going out?

Andy
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