ch12_s3.asm

51单片机基础篇 对于有一定基础的人看看 包含书中所以的源代码

     ;PROGRAM NAME S3.ASM
     ;TEST SERIAL PORT(MODE 1)
     ;
     BUZZER		REG 	P3.4
     LED		REG 	P3.7
     ;
     RESET		MOV	R0,#00H
       			DJNZ	R0,$
       			CLR	LED 
       			CLR	BUZZER
     ;
       			MOV 	TMOD,#00100000B			;TIMER 1 MODE2
       			MOV 	TH1，#FDH  			;BAUD RATE=9600b/s
       			SETB 	TR1 				;START TIMER 1
       			MOV 	SCON，#01010000B  		;T/R,1START BIT	
       								;8BITDATA,1STOP BIT
     START		CPL 	P1.0				;SYNC SIGNAL FOR SCOPE
       			CLR	TI 				;MONITOR TxD FROM SCOPE
       			MOV	A,#31H
       			MOV	SBUE,A	
     WAIT		JNB	TI,WAIT
     			SJMP	START				;IF ANY KEY HIT THEN
     ;
     DELAY		MOV	R0,#00H
     			DJNZ	R0,$
     				RET