CC2640R2F 串口烧录BIN文件

今天测试了下，将boot片选引脚更改为拉低有效，该片选脚无论悬空还是拉高，上电后板子正常跑，未进入boot。只有上电前拉低该片选引脚，才进入boot，这种机制解决了上面的问题。

有个疑问，上电前片选脚每次都悬空，这样做是否有问题？拉成固定电平肯定是最稳定的，但是我们想悬空该引脚。

请TI工程师帮忙协助，谢谢!

By default, the I/O driver (output) and input buffer (input) are disabled (tri-state mode) at power on or reset, and thus the I/O pin can safely be left unconnected (floating).
If the I/O pin is placed in the tri-state condition and connected to a node with a different voltage potential; there might be a small leakage current going through the pin. The same applies to an I/O pin configured as input, where the pin is connected to a voltage source (for example VDD / 2). The input is then an undefined value of either 0 or 1.