9/19/2023 0 Comments Radio clock signal![]() ![]() The Port A pins are used to drive the segments, so the definition for a complete digit can use a single write to the PORTA register. For consistency with the program I've labelled the digits 0 to 3: Here's the full circuit, which shows this in more detail. Note that this technique could be used for any other application that doesn't need to display more than 3999, like a digital voltmeter. These three tricks enabled me to drive all four 7-segment displays, plus the colon, degree dot, and two decimal points, using just 10 I/O pins, leaving one free for the clock input.
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