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A
B
B
+5V
A
PA0(PCINT/AD0/AREF/MISO)
PA1(PCINT1/ADC1/AIN00/TOCC0/TXD0/MOSI)
PA2(PCINT2/ADC2/AIN01/TOCC1/RXD0/SS)
PA3(PCINT3/ADC3/AIN10/TOCC2/T0/XCK0/SCK)