Using a MAX7219 (LED digit multiplexer) with a 16F88

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  1. - 13th February 2007, 14:06 #1
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    flotulopex
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    Default Using a MAX7219 (LED digit multiplexer) with a 16F88

    Hello,

    I have some trouble making a 5 digit LED display working.

    The display is driven by a MAX7219 multiplexer. My PIC16F88 pilots (well, it should...) the MAX7219.

    The actual status is: when I powerup the circuit, the LED display shows up some digits and nothing more. The program should make the display count up from 00000 to 65535.

    Before I invastigate the program, I think I may have a timing problem.

    Can somebody tell my if, according to the MAX7219's datasheet (I have attached an extract), I need to set 10MHz clock frequency on the PIC yes or no?

    If yes, can I do it with my 16F88 and how?
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    Roger
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