ببخشید، تو قسمت SPI Serial Programming زده :biggrin:
• PDO/TXD0 – Port E, Bit 1
PDO, SPI Serial Programming Data Output. During Serial Program Downloading, this pin is
used as data output line for the ATmega1281/2561. For ATmega640/1280/2560 this function is
placed on MISO.
TXD0, USART0 Transmit pin.
• PDI/RXD0/PCINT8 – Port E, Bit 0
PDI, SPI Serial Programming Data Input. During Serial Program Downloading, this pin is used
as data input line for the ATmega1281/2561. For ATmega640/1280/2560 this function is placed
on MOSI..