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SLEEP is an assembly instruction. You can execute assembly with GCC's Inline Assembly facility. In short: asm volatile("SLEEP"); will do what you want. The avr/sleep.h file has sleep_cpu() defined as: #define sleep_cpu() \ do { \ __asm__ __volatile__ ( "sleep" "\n\t" :: ); \ }...


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From the official SoftwareSerial Site: https://www.arduino.cc/en/Reference/softwareSerial (Section Limitations) Not all pins on the Leonardo and Micro support change interrupts, so only the following can be used for RX: 8, 9, 10, 11, 14 (MISO), 15 (SCK), 16 (MOSI).


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