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AVR is the family of microcontrollers used in Arduino boards.

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On Atmel (now Microchip) AVR microcontrollers, the sbi, cbi, sbis, and sbic assembly language instructions can only address the 32 IO ports at addresses between 0x20 and 0x3f. The Atmega168 and 328 … (used in Arduinos prior to the Leonardo) has WAY more than 32 IO registers, so only a subset of them can be addressed by sbi and cbi (the AVR instruction set was nailed down YEARS ago, when 32 IO …
answered May 22 '18 by Bitbang3r