51單片機STC89C52 串口接收（查詢）

ORG 0000H
LJMP MAIN 
MAIN:
MOV SCON,#50H
ANL PCON,#7FH	;SMOD=0
MOV TMOD,#20H
MOV TH1,#0FDH	;9600BPS
MOV TL1,#0FDH
SETB TR1
HERE1:
JNB RI,HERE1
MOV A,SBUF
CLR RI
MOV SBUF,A
SJMP HERE1
END