"PORTC =" command cannot compile in Arduino Due mode??

hi everyone, trying interface tft display in arduino due, need use "portc = " command instead of digitalwrite command in order have fastest speed drive display. program cannot compile , said"error: 'portc' not declared in scope" , while can compile same program without problem if select arduino uno.

i cannot believe took out simple command aruduino due, point

p.s there other way write port faster "digitalwrite" ? 


thanks

portc = not command, assignment statement.  reason such error if portc not defined.  have looked the sam3x datasheet , looked see calls various io ports?

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