数字和数字根的总和

Problem statement:

问题陈述：

Write an assembly language program in 8086 microprocessor to find sum of digit of an 8 bits number using 8 bits operation.

在8086微处理器中编写汇编语言程序，以使用8位运算找到8位数字的位数之和。

Assume 8 bit number is stored at memory location 2050.

假设8位数字存储在存储位置2050中。

Assumptions: Addresses of input data and output data are 2050 and 2051 respectively.

假设：输入数据和输出数据的地址分别为2050和2051。

Algorithm:

算法：

1. Load contents of memory location 2050 in register AL

   将存储单元2050中的内容加载到寄存器AL中

2. Copy content of register AL to register AH

   将寄存器AL的内容复制到寄存器AH

3. Assign 0004 to CX Register Pair

   将0004分配给CX寄存器对

4. Do AND operation on content of AL with 0F and store result in AL

   用0F对AL的内容执行AND运算，并将结果存储在AL中

5. Rotate the contents of AH by executing ROL instruction using CX

   通过使用CX执行ROL指令来旋转AH的内容

6. Do AND operation on content of AH with 0F and store result in AH

   用0F对AH的内容执行AND运算并将结果存储在AH中

7. Add AL and AH content and store result in AL

   添加AL和AH内容并将结果存储在AL中

8. Store the content of AL in memory location 2051

   将AL的内容存储在内存位置2051中

Program:

程序：

Mnemonics	Comments
MOV AL, [2050]	AL←[2050]
MOV AH, AL	AH←AL
MOV CX, 0004	CX ← 0004
AND AL, 0F	AL ← AL & 0F
ROL AH, CX	Rotate AH content left by 4 bits(value of CX)
AND AH, 0F	AH ← AH & 0F
ADD AL, AH	AL←AL+AH
MOV [2051], AL	[2051]←AL
HLT	Stop Execution

助记符	注释
MOV AL，[2050]	AL←[2050]
MO AH，AL	AH←AL
MOV CX，0004	CX←0004
AND AL，0F	AL←AL＆0F
ROL AH，CX	将AH内容向左旋转4位(CX值)
AND AH，0F	AH←AH＆0F
AH，AD AL	AL←AL + AH
MOV [2051]，AL	[2051]←AL
HLT	停止执行

Explanation

说明

1. MOV AL, [2050]: loads contents of memory location 2050 in AL

   MOV AL，[2050] ：将存储位置2050中的内容加载到AL中

2. MOV AH, AL: copy content of register AL to register AH

   MOV AH，AL ：将寄存器AL的内容复制到寄存器AH

3. MOV CX, 0004: assign 0004 to CX register pair

   MOV CX，0004 ：将0004分配给CX寄存器对

4. AND AL, 0F: does AND operation on content of AL with 0F and store result in AL

   AND AL，0F ：对具有0F的AL的内容执行AND运算并将结果存储在AL中

5. ROL AH, CX: rotate the content of AH register left by 4 bits i.e. value of CX register pair

   ROL AH，CX ：将AH寄存器的内容向左旋转4位，即CX寄存器对的值

6. AND AH, 0F: does AND operation on content of AH with 0F and store result in AH

   AND AH，0F ：用0F对AH的内容执行AND运算并将结果存储在AH中

7. ADD AL, AH: add AL and AH content and store result in AL

   添加AL，AH ：添加AL和AH内容并将结果存储在AL中

8. MOV [2051], AL: stores the content of AL in 2051 memory address

   MOV [2051]，AL ：将AL的内容存储在2051存储器地址中

9. HLT: stops executing the program

   HLT ：停止执行程序

翻译自: https://www.includehelp.com/embedded-system/find-sum-of-the-digits-of-an-8-bits-number-using-8086-microprocessor.aspx

数字和数字根的总和