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How to decode FSK caller-id with a AT89c2051?

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I need to decode FSK caller-id with a AT89c2051. Has anybody done that already? Or some other FSK decoding? I hope to do it by software to lower the costs.
I also try to locate the FSK protocol/signal description. I not found it.
tanks & best regards.
 

fsk caller id protocol

Hi,

take a look at Texas Instruments Web Site. Search for slaa037 Application note.
There is a good example of FSK demodulator. It is writen for MSP430, but it
will help you, I hope.

Best Regards,

Stoyanov
 

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