rdport equ 90h temp equ 20h edcode equ 0efh ch_fg bit p3.0 org 00h jmp start start: mov sp, #60h start1: jnb ch_fg, $ acall clear acall input acall length acall expand jb ch_fg, $ sjmp start1 clear: mov r0, #20h clear1: mov @r0, #00h inc r0 cjne r0,#80h,clear1 ret ; input: mov r0, #30h input1: jb ch_fg, $ mov a, rdport mov temp, a jnb ch_fg, $ cjne a,#edcode,test mov @r0, a test: anl a, #0fh cjne a,#10, $ 3 jnc input1 mov a, temp swap a anl a, #0fh cjne a,#10, $ 3 jnc input1 mov a, temp mov @r0, a inc r0 sjmp input1 ; length: mov r0, #30h mov 20h, #00h mov r1, #21h koop: mov a, @r0 cjne a, #00h ,koop1 ret koop1: inc 20h mov a, r0 mov @r1, a inc r0 sjmp koop ; expand: mov r0, #30h mov r1, #20h mov a, @r1 mov r2, a mov r3, #40h mov r4, #50h expand1:mov a, @r0 mov b, a swap a anl a, #00fh mov @r3, a mov a, b anl a, #00fh mov @r4, a inc r3 inc r4 inc r0 djnz r2, expand1 ret end ; 在expand中的程式~ compile的結果 有二行錯誤！分別是，mov @r3, a和mov @r4, a 可是我不會改… 可以麻煩告訴我解決的方法嗎？

MOV @Ri,A為間接定址，i=0或1，也就是只有 MOV @R0,A 或 MOV @R1,A 兩種用法。