Dec 11, 2012 #1 5 5282604 Full Member level 4 Joined Dec 19, 2009 Messages 194 Helped 3 Reputation 6 Reaction score 3 Trophy points 1,298 Location egypt Visit site Activity points 2,404 what is s3c2440 maximum gpio io pin speed in mhz . i need gpio speed. not cpu core speed.