I want to design a circuit as in the attached image. The block diagram in the image is not yet complete. I want the up and down button to switch between the four 7-segment display, as in when am done controlling one 7-segment I can switch to other 7-segment. At the same time, I want the 7-segment display the switch is controlling to be blinking to show which 7-segment the switch is controlling. I also want when power is off the number at the four 7-segment display to be retained when power is restored
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