ch13_s1.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 S1.ASM
;TEST SERIAL PORT MODE 0,SHIFT OUT
;
BUZZER  REG     P3.4
LED     REG     P3.7
RESET   MOV     R0,#00H
        DJNZ    R0,$
        CLR     BUZZER
        CLR     BUZZER
;
        MOV     SP,#60H
        MOV     SCON,#00000000B ;MODE 0 DEFINE
LOOP    MOV     A,#81H
        MOV     SBUF,A
        MUL     AB
        MUL     AB
        MOV     A,#AAH
        MOV     SBUF,A
        DIV     AB
        DIV     AB
        SJMP    LOOP
;