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there are dedicated pins for B5 (pin 32) and B11 (pin 30) which respectively also
have AIO252 and AIO251 functionality. In addition, GPIO20 (pin 48) and GPIO21 (pin 49) are also available as
B5 and B11 respectively. Since B5 and B11 are dedicated pins on this package, it is recommended to use them
instead of the ones on GPIO20/21.