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Thanks for the thorough response. - Michael

With Teensy 3.5 you could access multiple GPIO pins with a single instruction using macros like GPIOD_PDDR, GPIOD_PDIR and GPIOD_PDOR. Is this still possible with Teensy 4.1? For example: #define xDATA_IN() ((byte) (GPIOD_PDIR & 0xFF)) ... byte b = xDATA_IN(); Thanks.