存儲器間接尋址方式

The Program Memory Addressing mode is used in branch instructions. These branch instructions are instructions which are responsible for changing the regular flow of the instruction execution and shifting the control to some other location. In 8086 microprocessor, these instructions are usually JMP and CALL instructions.

在分支指令中使用程序存儲器尋址模式 。 這些分支指令是負責更改指令執行的常規流程并將控件移至其他位置的指令。 在8086微處理器中，這些指令通常是JMP和CALL指令。

The Program memory Addressing Mode contains further three addressing modes within it. They are:

程序存儲器尋址模式中還包含另外三種尋址模式。 他們是：

1. Direct Program memory Addressing

   直接程序存儲器尋址

2. Indirect Program memory Addressing

   間接程序存儲器尋址

3. Relative Program memory Addressing

   相對程序存儲器尋址

Let us study each of them in detail about their instructions and the way of processing by the microprocessor while executing them.

讓我們詳細研究它們中的每一個，以了解它們的指令以及在執行它們時微處理器的處理方式。

1)直接程序存儲器尋址 (1) Direct Program Memory Addressing)

In this addressing mode, the offset address where the control is to be shifted is defined within the instruction. This mode is called direct addressing mode because the required address is directly present in the instruction rather than being stored in some register.

在該尋址模式下，將在指令內定義要在其中移動控件的偏移地址。 這種模式稱為直接尋址模式，因為所需的地址直接存在于指令中，而不是存儲在某個寄存器中。

Example:

例：

    JMP 4032H

Here, the working of the above instruction will be as follows:

在這里，以上指令的工作方式如下：

The current value of IP which holds the address of next instruction to be executed will be stored in the TOP OF THE STACK. Now, the IP will be replaced by the mentioned value, i.e. IP

持有下一條要執行指令地址的IP的當前值將存儲在堆棧頂部 。 現在，IP將被上述值替換，即IP

Now, the Memory address is calculated as: (Contents of CS) X 10H + (contents of IP)

現在，內存地址的計算公式為： (CS的內容)X 10H +(IP的內容)

2)間接程序尋址模式 (2) Indirect Program Addressing mode)

As the name suggests, in this addressing mode, the offset address is not present directly in the instruction. It is rather stored in any of the CPU registers (Internal Register). So, the contents of the Instruction Pointer (IP) will be replaced by the contents of that register.

顧名思義，在這種尋址模式下，偏移地址不直接存在于指令中。 而是存儲在任何CPU寄存器(內部寄存器)中。 因此，指令指針(IP)的內容將被該寄存器的內容替換。

Example:

例：

    JMP BX

Working:

加工：

Suppose that the content of the BX register is 0003H. So, the working of the microprocessor for executing the above instruction will be as follows:

假設BX寄存器的內容為0003H 。 因此，微處理器用于執行以上指令的工作如下：

            IP 
And the required memory address is calculated in a similar way as in Direct Addressing mode: (Contents of CS) X 10H + (contents of IP)
3) Relative Program Memory Addressing
In this Addressing mode, the offset address is equal to the content of the Instruction Pointer (IP) plus the 8 or 16-bit displacement. For the 8 bit displacement, SHORT is used and for 16-bit displacement, LONG is used. This type of displacement will only be intra-segment, i.e. within the segment.
Example:
Here, SHORT is used to represent the 8-bit displacement and OVER is the Label defined for any particular memory location.



TOP Interview Coding Problems/Challenges
Run-length encoding (find/print frequency of letters in a string) 
Sort an array of 0's, 1's and 2's in linear time complexity 
Checking Anagrams (check whether two string is anagrams or not) 
Relative sorting algorithm 
Finding subarray with given sum 
Find the level in a binary tree with given sum K 
Check whether a Binary Tree is BST (Binary Search Tree) or not 
1[0]1 Pattern Count 
Capitalize first and last letter of each word in a line 
Print vertical sum of a binary tree 
Print Boundary Sum of a Binary Tree 
Reverse a single linked list 
Greedy Strategy to solve major algorithm problems 
Job sequencing problem 
Root to leaf Path Sum 
Exit Point in a Matrix 
Find length of loop in a linked list 
Toppers of Class 
Print All Nodes that don't have Sibling 
Transform to Sum Tree 
Shortest Source to Destination Path 



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            IP 
And the required memory address is calculated in a similar way as in Direct Addressing mode: (Contents of CS) X 10H + (contents of IP) 
3) Relative Program Memory Addressing
In this Addressing mode, the offset address is equal to the content of the Instruction Pointer (IP) plus the 8 or 16-bit displacement. For the 8 bit displacement, SHORT is used and for 16-bit displacement, LONG is used. This type of displacement will only be intra-segment, i.e. within the segment.
 Example: 
Here, SHORT is used to represent the 8-bit displacement and OVER is the Label defined for any particular memory location.



TOP Interview Coding Problems/Challenges
 Run-length encoding (find/print frequency of letters in a string) 
 Sort an array of 0's, 1's and 2's in linear time complexity 
 Checking Anagrams (check whether two string is anagrams or not) 
 Relative sorting algorithm 
 Finding subarray with given sum 
 Find the level in a binary tree with given sum K 
 Check whether a Binary Tree is BST (Binary Search Tree) or not 
 1[0]1 Pattern Count 
 Capitalize first and last letter of each word in a line 
 Print vertical sum of a binary tree 
 Print Boundary Sum of a Binary Tree 
 Reverse a single linked list 
 Greedy Strategy to solve major algorithm problems 
 Job sequencing problem 
 Root to leaf Path Sum 
 Exit Point in a Matrix 
 Find length of loop in a linked list 
 Toppers of Class 
 Print All Nodes that don't have Sibling 
 Transform to Sum Tree 
 Shortest Source to Destination Path 


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翻譯自: https://www.includehelp.com/embedded-system/program-memory-addressing-mode-of-8086.aspx

存儲器間接尋址方式