UART GPIO

GPIO

http://clhjoe.blogspot.tw/2012/07/gpio.html

http://kezeodsnx.pixnet.net/blog/post/30257192-%E6%88%91%E6%89%80%E7%9F%A5%E9%81%93%E7%9A%84gpio

UART

http://tw.classf0001.uschoolnet.com/css000000183803/cm4k-1358643234-5169-6453.pdf

http://www.nspark.org.tw/webfiles/technical%20report.pdf