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【单选题】
下列串行通信程序的功能是( )。 void main() { uchar temp=0; TMOD=0x20 ; /*设置定时器T1为方式2*/ TH1=0xfd ; /*波特率9600*/ TL1=0xfd ; SCON=0x40 ; TR1=1 ; while(1) {temp=P1 ; /*读入P1口的状态数据*/ SBUF=temp ; while(TI==0); TI=0; } }A.
读入 P1 口状态数据，再通过串口发送数据
B.
通过串口接收数据，然后发送到 P1 口
C.
读入 P1 口状态数据，通过串口接收数据
D.
通过串口发送数据到 P1 口
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A.
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