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max7219 code problem

max7219 code problem

I'm creating a project using 7-segment displays and the max7219. To test the 7219, which I've never used before, I wrote a simple program to increment a number and output to the display every 20ms. My problem is that at 800 the program stops. Any ideas on why this happens? It doesn't matter if I start at zero or 500 or 750, it always stops ...

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