51單片機STC89C52 串口發送字符

BEEP BIT P2.3
LCDEN BIT P3.4
LED BIT P1.0

ORG 0000H
LJMP MAIN 
MAIN:
MOV TMOD,#20H
MOV TH1,#0FDH
MOV TL1,#0FDH
SETB TR1
MOV SCON,#40H
ANL PCON,#7FH
HERE:
CPL BEEP
CPL LED
MOV SBUF,#32H
LCALL DELAY
SJMP HERE
DELAY:
SETB RS1
MOV R2,#4
DELAY2:
MOV R1,#200
DELAY1:
MOV R0,#250
DELAY0:
NOP
NOP
DJNZ R0,DELAY0
DJNZ R1,DELAY1
DJNZ R2,DELAY2
CLR RS1
RET
END