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CC1310: 固件例程中，串口引脚初始化配置时，TXD脚配置为pushpull，RXD脚配置为pulldown,为什么不是上拉或浮空？

user6315808
Prodigy 120 points
Part Number: CC1310

如题：固件例程中，串口引脚初始化配置时，RXD脚配置为pulldown,接收脚为什么不是上拉或浮空？在stm32例程中，常见设置成浮空或上拉。