一道单片机编程题目 一道单片机的编程题

\u4e00\u9053\u5355\u7247\u673a\u7684\u7f16\u7a0b\u9898

\u73b0\u5047\u5b9a\u5de6\u8fb9\u662f\u5730\u5740\uff0c\u53f3\u8fb9\u7684\u662f\u5185\u5bb9
1.\u5b83\u7684\u529f\u80fd\u662f\u4ee550H\u4e3a\u9996\u5730\u5740\uff0c\u4e2a\u6570\u4e3a0AH\u4e2a\u7684RAM\u5168\u90e8\u6e05\u96f6

2.\u673a\u5668\u7801
7A 0A\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7MOV R2,#0AH
mov rn\u7684\u673a\u5668\u7801\u662f01111xxx\uff0c\u5176\u4e2dxxx\u7531Rn\u7684\u5730\u5740\u6765\u51b3\u5b9a\uff0c\u76f8\u5e94\u5730\uff0cR0~R7\u4e8c\u8fdb\u5236\u5730\u5740\u4e3a000~111
\u90a3\u4e48R2\u5c31\u662f010\uff0c\u540e\u9762\u7684\u6570\u636e\u5c31\u8ddf\u7740mov rn\u7684\u673a\u5668\u7801\u540e\u9762


7850\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7MOV R0,#50H
E4 \u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7CLR A\uff1b
\u673a\u5668\u7801\u56fa\u5b9a
F6 \u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7LOOP:MOV @R0,A

mov @rn\uff0ca\u673a\u5668\u7801\u4e3a1111011n
n\u5c31\u662fRn\u7684n
\u6240\u4ee5\u95f4\u63a5\u5bc4\u5b58\u5668\u5bfb\u5740\u53ea\u80fd\u662fR1\u6216R0

08 \u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7INC R0
inc rn\u673a\u5668\u7801\u4e3a00001xxx
xxx\u540c\u7406\u4e3aRn\u7684\u7269\u7406\u5730\u5740

DA__ \u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7DJNZ R2,LOOP
djnz rn\u673a\u5668\u780111011xxx
xxx\u540c\u7406\u4e3aRN\u7684\u7269\u7406\u5730\u5740
loop\u4e3a8\u4f4d\u5730\u5740\u6807\u53f7
\u673a\u5668\u7801\u662f\u4ee5loop\u4e3a\u9996\u7684\u7b2c\u4e00\u4e2a\u6307\u4ee4\u79bbloop\u7684\u5355\u5143\u6570
\u6240\u4ee5djnz r2\uff0cloop\u7684loop\u4e0d\u80fd\u653e\u5728\u6b64\u540e\u8d85\u8fc7255\u5b57\u8282\u7684\u7a0b\u5e8f\u7a7a\u95f4\u5355\u5143
\u9898\u4e2dloop\uff1a\u540e\u9762\u8ddf\u6709MOV @R0,A\u53601\u4e2a\u5185\u90e8ram\u5355\u5143\uff0cINC R0\u53601\u4e2a\u5185\u90e8ram\u5355\u5143\uff0cDJNZ R2\u53601\u4e2a\u5185\u90e8ram\u5355\u5143\uff08\u7531\u673a\u5668\u7801\u53ef\u5f97\uff09\uff0c\u6240\u4ee5255-3=252=FCH
\u5373\u673a\u5668\u7801\u4e3aDAFC


\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7DONE:

3.\u5bf9\u4e8e\u7b2c\u4e09\u4e2a\u95ee\u9898\uff0c\u697c\u4e0a\u7684\u65b9\u6cd5\u6709\u8bef
\uff0cR0\u548cR2\u6709\u53ef\u80fd\u572800H~A0H
\u800c\u4e14\u4f60\u53ea\u662f\u628a0~10\u653e\u516550H~5AH\u5355\u5143
\u6240\u4ee5\u53ef\u4ee5\u8fd9\u6837
SETB RS1
SETB RS0;R0\u5de5\u4f5c\u572818H\u5355\u5143
MOV A,#50H
MOV R2,#10
MOV R0,#0
LOOP:
MOV @R0,A
INC A
INC R0
DJNZ R2,LOOP

\u7ecf\u4eff\u771f\u65e0\u8bef

\u4e0d\u77e5\u9053\u4f60\u7528\u4ec0\u4e48\u82af\u7247\uff0c\u8fd9\u91cc\u5c31\u62ff\u8ba1\u7b97\u673a\u7684\u6c47\u7f16\u6765\u6f14\u793a\u4e00\u4e0b\u600e\u4e48\u7b97\u5427
\u56e0\u4e3a\u5355\u7247\u673a\u6ca1\u6709\u4e58\u6cd5\u8fd0\u7b97\uff0c\u6240\u4ee5\u4e0d\u80fd\u7528\u4e58\u6cd5\u6307\u4ee4\uff0c\u4f46\u662f\u6211\u4eec\u53ef\u4ee5\u7528\u79fb\u4f4d\u6307\u4ee4\u5b9e\u73b0
mov
al,31h
mov
ah,30h
shl
al,1
;\u5de6\u79fb\u4e00\u4f4d
rcl
ah,1
;\u5e26\u8fdb\u4f4d\u5faa\u73af\u5de6\u79fb
\u8fd9\u6837\u5c31\u53ef\u4ee5\u4e86\uff0c\u56e0\u4e3a\u5355\u7247\u673a\u90fd\u662f8\u4f4d\u7684\u5bc4\u5b58\u5668\uff0c\u6240\u4ee5\u6211\u4e5f\u75288\u4f4d\u6765\u6f14\u793a\uff0c\u547d\u4ee4\u4f60\u53ef\u4ee5\u5bf9\u7167\u4f60\u7684\u82af\u7247\u7684\u547d\u4ee4\u7a0d\u4f5c\u6539\u53d8\u5c31\u53ef\u4ee5\u4e86\uff0c\u5de6\u79fb\u4e00\u4f4d\u5c31\u662f\u4e58
2

不知道你用什么芯片，这里就拿计算机的汇编来演示一下怎么算吧
因为单片机没有乘法运算，所以不能用乘法指令，但是我们可以用移位指令实现

mov al,31h
mov ah,30h
shl al,1 ;左移一位
rcl ah,1 ;带进位循环左移
这样就可以了，因为单片机都是8位的寄存器，所以我也用8位来演示，命令你可以对照你的芯片的命令稍作改变就可以了，左移一位就是乘 2

不是双字节乘以双字节，不用那么麻烦。不管是几位二进制数，乘以2的话就是整体左移一位
51的汇编

CLR C
MOV A,31H
RLC A
MOV 31H,A
MOV A,30H
RLC A
MOV 30H,A

可能的进位存在于C中

mov r1,30h
mov r2,31h
mov r3,#00h
mov r4,#00h
mov r5,#00h
mov r6,#02h
LCALL TWOBITMUL
mov 30h,r3
mov 31h,r4

;===========================双字节二进制乘法子程序========================================================
;===============被乘数的入口地址为R1~R2,乘数的入口地址为R5~R6,积在R1~R4中，都是高位在前==============================
TWOBITMUL:
MOV A,R2
MOV B,R6
MUL AB
MOV R4,A
MOV R3,B
;--------------R2与R6相乘暂存部分积----------------------------
MOV A,R2
MOV B,R5
MUL AB
CLR C
ADDC A,R3
MOV R3,A
MOV R2,B
JNC NEXT1
INC R2
;-------------R2与R5相乘暂存部分积------------------------------
NEXT1:
MOV A,R1
MOV B,R6
MUL AB
CLR C
ADDC A,R3
MOV R3,A
JNC NEXT2
INC R2
CLR C
NEXT2:
MOV A,B
ADDC A,R2
JNC NEXT3
MOV R7,#01H
AJMP NEXT4
NEXT3:
MOV R7,#00H
NEXT4:
MOV R2,A
;--------------R1与R6相乘暂存部分积---------------------------
MOV A,R1
MOV B,R5
MUL AB
CLR C
ADDC A,R2
MOV R2,A
MOV R1,B
JNC FINISH9
INC R1
FINISH9:
MOV A,R7
ADD A,R1
MOV R1,A
RET

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