终端低功耗时无用管脚是该设为什么状态

终端低功耗时无用管脚是该设为高阻么？还是其他的状态

7.1 Unused I/O Pins

Unused I/O pins should have a defined level and not be left floating. One way to do this is to leave the pin unconnected and configure the pin as a general-purpose I/O input with pullup resistor. This is also the state of all pins during and after reset (except P1.0 and P1.1, which do not have pullup or pulldown capability). Alternatively, the pin can be configured as a general-purpose I/O output. In either case, the pin should not be connected directly to VDD or GND, in order to avoid excessive power consumption.

摘自： http://www.ti.com.cn/cn/lit/ug/swru191f/swru191f.pdf 

一般设置上拉输入状态：方向寄存器设置为输入模式，输出寄存器设置高电平。