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关于CC2541的USART的问题

Other Parts Discussed in Thread: CC2541, BLE-STACK

TI专家您好,我看CC2541的数据手册,该芯片内部是有USART模块的。我想问的是,无论是SPI还是UART模式,都没有相应的管脚引出,那么这个CC2541中的USART怎么用呢。  该芯片的USART能否和外部设备的SPI或UART口进行有线通讯