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430普通IO的驱动能力

Other Parts Discussed in Thread: MSP430F5438A

一个普通IO的输出电流怎么算,什么时候可以达到最大电流。最大电流为多少,技术手册中的VOH,VOL是什么意思,“Outputs – Ports Px”表格中“TEST CONDITIONS”为“I(OHmax) = –6 mA(1)”是什么意思?电流怎么是负的?