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есть скетч для мега 2560 мне нужно перенсти его на атмега1284 - есть некоторые морменты мне не понятные. 

#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
// Arduino Mega is now tested and confirmed, with the following caveats:
// Because digital pins 2-7 don't map to a contiguous port register,
// the Mega requires connecting the matrix data lines to different pins.
// Digital pins 24-29 are used for the data interface, and 22 & 23 are
// unavailable for other outputs because the software needs to write to
// the full PORTA register for speed.  Clock may be any pin on PORTB --
// on the Mega, this CAN'T be pins 8 or 9 (these are on PORTH), thus the
// wiring will need to be slightly different than the tutorial's
// explanation on the Uno, etc.  Pins 10-13 are all fair game for the
// clock, as are pins 50-53.
#define DATAPORT PORTA ///< RGB data PORT register
#define DATADIR DDRA   ///< RGB data direction register
#define CLKPORT PORTB  ///< RGB clock PORT register
#elif defined(__AVR_ATmega32U4__)
// Arduino Leonardo: this is vestigial code an unlikely to ever be
// finished -- DO NOT USE!!!  Unlike the Uno, digital pins 2-7 do NOT
// map to a contiguous port register, dashing our hopes for compatible
// wiring.  Making this work would require significant changes both to
// the bit-shifting code in the library, and how this board is wired to
// the LED matrix.  Bummer.
#define DATAPORT PORTD ///< RGB data PORT register
#define DATADIR DDRD   ///< RGB data direction register
#define CLKPORT PORTB  ///< RGB clock PORT register
#elif defined(ARDUINO_ARCH_SAMD) || defined(ARDUINO_ARCH_ESP32)
// Support for ATSAMD21-based boards, done with PortType!
#else
// Ports for "standard" boards (Arduino Uno, Duemilanove, etc.)
#define DATAPORT PORTD ///< RGB data PORT register
#define DATADIR DDRD   ///< RGB data direction register
#define CLKPORT PORTB  ///< RGB clock PORT register
#endif

из этого следует что матрица по RGB подключена к порту D  а потр тактирования B?