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<F28335>请问GPIO如何设置为高阻态？

XueLin Liang1
Prodigy 20 points

          28335的DataSheet(SPRS439N)的Signal Descriptions明确说明GPIO有(I/O/Z)三个状态，《TMS320x2833x, 2823x System Control and Interrupts.pdf》的GPIO章节的GPIO0 to GPIO27 Multiplexing Diagram上也有High-Impedance
Output Control字样。

          但是我没有找到能控制GPIO 高阻状态的寄存器，请教各路大神具体如何设置，才能使GPIO处于High-Impedance状态。