Answer: Assembler instruction generates machine code, thus contributes towards the size of the program .
Assembler directive does not create any machine code
,thus does not contribute to program size.It directs the assembler to perform certain actions during assembly phase.
What are assembler directives?
Assembler directives are
directions to the assembler to take some action or change a setting
. … text directive tells the assembler that the information that follows is program text (assembly instructions), and the translated machine code is to be written to the text segment of memory.
What is difference between instruction and directives?
Key difference: A directive is
mainly an order
, usually issued by an authority. A directive may establish policy, assign responsibilities, define objectives and delegate authority to those working in and with the authoritative figure. Instructions, on the other hand, act as guidelines.
What is assembler directives with example?
Directives are instructions used by the assembler to help automate the assembly process and to improve program readability. Examples of common assembler directives are
ORG (origin), EQU (equate), and DS. B (define space for a byte)
.
What is a directive instruction?
Directivenoun. An
instruction or guideline that indicates how to perform an action or reach a goal
.
What is the purpose of instructional directive?
An instructional directive is
a legally binding statement in which you consent to, or refuse, future medical treatment
. Your instructional directive takes effect as if you had consented to, or refused the treatment.
What are the different types of branch instructions?
- Jump (unconditional and conditional)
- Call (unconditional and conditional)
- Return (unconditional and conditional)
Why are assembler directives required?
The assembler directives control organization of the program and
provide necessary information to the assembler to understand assembly language programs to generate machine codes
. They indicate how an operand or a section of program is to be processed by the assembler.
How many assembler directives are there?
5 Assembler Directives
. Assembler directives supply data to the program and control the assembly process.
What are the assembler directives of 8086?
An assembler supports directives
to define data, to organise segments to control procedure, to define macros
. It consists of two types of statements: instructions and directives. The instructions are translated to the machine code by the assembler whereas directives are not translated to the machine codes.
Which of the following assembler directives are used to define a procedure?
Explanation: The assembler directive that are used for defining a procedure in the 8086 microprocessor are:
PROC and ENDP
.
Which directive ends a procedure?
The ENDP directive
marks the end of the main procedure.
Which are advanced assembler directives?
- = Assigns a value to a symbol (same as EQU)
- EQU. Assigns a value to a symbol (same as =)
- ORG. Sets the current origin to a new value. …
- DS. Defines an amount of free space. …
- ID. Sets the PIC’s identification bytes. …
- INCLUDE. Loads another source file during assembly. …
- FUSES. …
- IF <expression>
What is a proxy directive?
A proxy directive (also called durable power of attorney for health care) is
a legal document in which one person grants another person the authority to make medical decisions if he or she becomes unable to do so
.
What is the structure of assembly language program?
An assembly language program is a series of statements, which are
either assembly language instructions such as ADD and MOV, or statements called directives
. A square bracket ( [ ] ) indicates that the field is optional. The label field allows the program to refer to a line of code by name.
What are the fixed tables are required by assembler to generate object code?
MOT is a fixed length table i.e. we make no entry in either of the passes. It is used to accept the instructions and convert/gives its binary
opcode
. In pass 1, using mnemonic Opcode, MOT is consulted to update location Counter (LC). 1) Binary opcode (to generate the instruction).
