from this topic http://arduino.cc/forum/index.php/topic,104051.0.html on my project port B is using by USB Host: MAX3421E Issue is on other serial port don't have pin connection for their XCK pins . If I use them in SPI mode I don't have pin for SCK . What should i do? please help smart guys. …

Which ports could I use as SPI on Arduino MegaADK if i can't use port B ?

nickgammon May 3, 2012, 5:18am 2

KhunakornX:
Issue is on other serial port don't have pin connection for their XCK pins .

Why not?

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