0832wave.asm

来自「MCS-51单片机实验 39个实用实验和源码」· 汇编 代码 · 共 27 行

;FOR    EAT598
D_APORT EQU     0F218H        ;0832 口地址
        ORG     0000H
        AJMP    START
        ORG     0040H
START:
        MOV     SP,#60H     ;产生锯齿波
        mov     r0,#00h
        MOV     A,#00H
        mov     dptr,#d_aport
bb:     movx    @dptr,a
        inc     a
        cjne    a,#0ffh,bb
        djnz    r0,bb
        
        mov     r0,#00h     ;产生三角波
        MOV     A,#00H
        mov     dptr,#d_aport
cc:     movx    @dptr,a
        inc     a
        cjne    a,#0ffh,cc
dd:     movx    @dptr,a
        dec     a
        cjne    a,#0ffh,dd
        djnz    r0,cc
        sjmp    start
        end