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Interfacing between ADC0804 and PIC18LF4620

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handsprince

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i want connect an ADC0804 output to my PIC18LF4620, the problem is, before connect to the PIC ports the voltage is 5V, but when i connect to PIC PORT, the voltage is 0v. why?? i'm suing two different board one is ADC0824 board another is PIC board, i had ground them together but with different VDD supply source.
 

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