Writing to GPIOs on two different ports at the same time?

[dannyf]

It is impossible and unnecessary to have your original ask ("changing pin states on different ports at the same time").

It is possible and depending on the spec, to change the pin state on different ports sufficiently fast.

Understanding the timing on the software is key

[gerburgplo]

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[trimarco232]

Is there an easy way to synchronize writes to GPIOs on two different ports so they happen at the same time?

unless in some highly-specialized cases, the answer is no.
two ways that I can think of:
1. you can use timer output compares to output up to 4 pin states. those OC pins can be on different ports.
2. you can use analog comparators to output to different pins / on different ports.
in both cases, the number of pins you can output to is highly limited.

Hi , you can synchronize the timers , so the number of pins is near to bit unlimited