Chapter 6 Assembly Language Programming Flashcards

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1
Q

What language does the CPU recognize?

A

The CPU recognizes only machine code

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2
Q

In what kind of format is machine code?

A

Machine code is in binary format.

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3
Q

What is a machine code instruction?

A

A machine code instruction is a binary code with a defined number of bits that comprises an opcode and most often one operand.

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4
Q

What is the machine code comprised of?

A

Opcode - is the portion of a machine language instruction that specifies the operation to be performed
Operand - the data to be processed
Address mode - Stores address
Register addressing

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5
Q

Write an example of a register transfer notation and its meaning?

A

CU control unit

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6
Q

What other language is a better alternative to machine code for programmers and why?

A

Assembly language because it helps in writing the program with comments and symbolic names for constants, macros and subroutines can be used more often in the code.

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7
Q

What instructions does the assembly language need to tell the assembler how to convert the code in machine code?

A

Directives and system calls

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8
Q

What are addressing modes?

A

Addressing modes are the ways of identifying the value that is to be written to the register.

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9
Q

How are the types of addressing modes identified

A

Immediate: the value to be used as it is in the instruction
Direct: An address which holds the value to be used in the instruction
Indirect: An address that holds the address of the value to be used in the instruction
Indexed: An address to which must be added what is currently in the Index Register (IX) to get the address that holds the value to be used in the instruction

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10
Q

In an instruction what can the operand be?

A

<address>
#n is a denary number, when it is direct addressing
</address>

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11
Q

Which are the data movement instructions?

A
LDM
    Immediate addressig
    #n
LDR
    Immediate addressig
    #n
LDD
    Dierct addressing
    <address>
LDI
    Indirect addressing
    <address>
LDX
    Indexed addressing
    <address>
STO
    Storing the contents of ACC
    <address></address></address></address></address>
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12
Q

Which are the arithmetic instructions?

A
ADD
    Adds the contend of the ACC with the content from the address
    <address>
INC
    Increases value with 1

DEC
Decreases value with 1

</address>

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13
Q

Which are the comparisons and jumps instructions?

A

JMP
Jump to address
<address>
CMP
Compare ACC content with register content
<address>
CMP
Compare ACC cotent with n
#n
JPE
Jump to address if previous comparison was true
<address>
JPN
Jump to address if previous comparison was NOT true
<address></address></address></address></address>

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