Unconditional transfer instructions of 8086

 

 

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Microprocessors Questions and Answers - Instruction Set of 8086/8088 - 1. This set of Microprocessor Multiple Choice Questions & Answers (MCQs) focuses on "Instruction Set of 8086/8088 - 1". 1. The instruction that is used to transfer the data from source operand to Transfer-of-control instructions consist of jumps, calls, and returns. Any of the transfers can be unconditional, or can be conditional based The 8086 memory structure consists of two components-the memory space and the input/output space. All instruction code and operands reside in the A.6 : Classifications of 8086 Assembly Instructions The instructions of the 8086 microprocessor can be grouped and sub-grouped into many Multiplication mul imul aam Unconditional Transfer call ret jmp External Synchronization hlt wait esc lock Division div idiv aad cbw cwd Iterations Control loop 16 8086 instructions -control transfer /branching instructions. By Namitha Ramachandran Download. Processor Control and Control Transfer Instructions of 8086. Instruction set of 8086/8088. The 8086 microprocessor supports 6 types of Instructions. They are 1. Data transfer instructions. Unconditional transfer instructions 1. CALL : Call a procedure, save return address on stack 2. RET : Return from procedure to the main program. Unconditional Jump. Transfers control to another part of the program. When immediate is greater then 1, assembler generates several RCL xx, 1 instructions because 8086 has machine code only for this instruction (the same principle works for all other shift/rotate instructions). Data Transfer Instructions These instructions are used to transfer the data from one operand to another. XLAT instruction: This instruction is used to translate the byte in AL using a table in memory pointed by BX. Example: WAP in AL of 8086 to find the square of a number between 1 and 15. Since instructions are normally waiting in the queue, the time needed to fetch many instructions of the microcomputer's program is eliminated. MOVSB,MOVSW: This instruction transfer data from one memory location to another. This is the only memory-to-memory transfers allowed in 8086 MPU. unconditional jumps. The basic instruction that transfers control to another point in the program is JMP. Note: the latest version of the integrated 8086 assembler automatically creates a workaround by replacing the conditional jump with the opposite, and adding big unconditional jump. Another advantage of 8086 instruction set is that it is much smaller, and thus easier to learn. Emu8086 has a much easier syntax than any of the major assemblers Unconditional Jump. Transfers control to another part of the program. 4-byte address may be entered in this form: 1234h:5678h, first value is As instructions are explained, simple applications are presented to illustrate the operation of the instructions 6-1 The Jump Group 192 Unconditional Jump (JMP) 193 The instruction set of the 80386 microprocessor was upward-compatible with the earlier 8086, 8088, and 80286 microprocessors. Program Execution Transfer instructions. These instructions are similar to branching or looping instructions. Unconditional transfer instructions. CALL : Call a procedure, save return address on stack. RET : Return from procedure to the main program. Program Execution Transfer instructions. These instructions are similar to branching or looping instructions. Unconditional transfer instructions. CALL : Call a procedure, save return address on stack. RET : Return from procedure to the main program. JMP Des : Unconditional Jump This instruction unconditionally transfers the control of execution to the specified address using an 8-bit or By using these string instructions, the size of the program is considerably reduced. The 8086 supports a set of more powerful instructions for string manipulations. Virtual 8086 mode (also called V86 mode) is a dynamic mode in the sense that the processor can switch repeatedly and rapidly between V86 mode and Considers instructions in functionally related groups; for example, string instructions are considered in one section, while control-transfer

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