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what is the max freq i pic can measure through a PIC input

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Back a couple of decades, MicroChip published an application note for a 50MHz frequency counter using an OTP chip (it was before EEPROM devices) and 7 segment LED displays. There have been numerous individual improvements to this, using more modern EEPROM chips and LCD displays.

Note this is a guaranteed 50MHz, in practice individual chips will probably exceed this.
 
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