cc2530，cc-debug为何要占一个串口？

1.cc-debug连接显示，cc-debug不仅要占用debug口（p2.1,p2.2）还要占用2530芯片一个spi串口，这是为何？只用p2.1,p2.2，不能调试和烧录吗？

请看CC DEBUGER的用户手册： In order to use the packet sniffer capabilities of the CC Debugger, it is also necessary to connect the

SPI bus to the SoC. The SPI interface is used by the CC Debugger for reading the captured RF
packets from the SoC.

用户手册地址：http://www.ti.com/lit/ug/swru197g/swru197g.pdf