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Original Message
RE: No output or invalid output on a 74HC595 shift register
Posted by fredtr on July 4, 2017 at 08:18:32:
Microchip has a good forum for questions like this. With that said, write simple routines to toggle MR, OE, STCP and SHCP and make sure they are toggling the way you think they are. Since these are pins you didn't use for the 7 segment display, you may not be configuring them correctly or an interconnect problem.