从机.asm

RS485标准的C51通信程序

;从机程序：
           ORG  0000H
		   LJMP MAIN
		   ORG  00F0H
  MAIN:	   MOV  SP,#06H
           MOV  TMOD,#20H
		   MOV	TH1,0FDH
		   MOV  TL1,0FDH
		   MOV  SCON,#50H
		   MOV  PCON,#00H
		   SETB TR1
		   CLR  P3.4
		   CLR  P3.5

REC:
           JNB  RI,$
		   MOV  A,SBUF
		   CLR  RI
		   CPL  A
		   MOV  P1,A
		   AJMP REC
		   ;
		   END