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f28027 spi fifo 的中断标志清除问题?



执行完   SpiaRegs.SPIFFTX.bit.TXFFINTCLR=1;  // Clear Interrupt flag不是应该清除FIFO发送的中断标志位TXFFINT Flag(SPIFFTX).7)位吗?为什么SPIFFTX寄存器中的值总是0xE0A2?