C8051F04X单片机被配制成4线单主机模式，SPI时钟500KHZ，因为SPI从机翻译主机指令和写相应数据到SPIODATE寄存器需要一定的时间-This program configures a C8051F04x as a 4-wire SPI Single Master. // // The SPI clock in this example is limited to 500 kHz when used with the // SPI0_Slave code exampl