as supports the following names for registers:
general register 0
general register 1
general register 2
general register 3
general register 4
general register 5
general register 6
general register 7
general register 8
general register 9
general register 10
general register 11
general register 12
general register 13
general register 14
general register 15
general register 16
general register 17
general register 18
general register 19
general register 20
general register 21
general register 22
general register 23
general register 24
general register 25
general register 26
general register 27
general register 28
general register 29
general register 30
general register 31
system register 0
system register 1
system register 2
system register 3
system register 4
system register 5
system register 16
system register 17
system register 18
system register 19
system register 20
The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.