Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Microprocessors > Chapter 2-1 > Flashcards

Chapter 2-1 Flashcards

1
Q

Is considered as this because its registers are used during application programming and are specified by the instructions.

A

Program Visible

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Are considered as this because they are not addressable directly during applications programming, but may be used indirectly during system programming.

A

Program Invisible

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the 8-bit registers

A

AH, AL, BH, BL, CH, CL, DH, DL

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Are referred to when an instruction is formed using two-letter designations.

A

8-bit registers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are the 16-bit registers

A

AX, BX, CX, DX, SP, BP, DI, SI, IP, FLAGS, CS, DS, ES, SS, FS, GS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are the 32-bit registers?

A

EAX, EBX, ECX, EDX, ESP, EBP, EDI, ESI, EIP, EFLAGS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Override used to access lower-order byte

A

B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Override used to access lower-order word

A

W

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Override used to access lower-order doubleword

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Override used to access lower-order quadword

A

There is no special letter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What are the Multipurpose Registers?

A

RAX, RBX, RCX, RDX, RBP, RDI, RSI, R8 - R15

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Is used for instructions such as multiplication, division and some of the adjustment instructions.

A

Accumulator (RAX)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

32, 16, and 8 bit register reference of RAX

A

EAX; AX; AH or AL

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Sometimes holds the offset address of a location in the memory system in all versions of the microprocessor.

A

Base Index (RBX)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

32, 16, and 8 bit register reference of RBX

A

EBX; BX; BH & BL

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Is a general-purpose register that also holds the count for various instructions.

A

Count (RCX)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

32, 16, and 8 bit register reference of RCX

A

ECX; CX; CH or CL

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Uses CL as the count

A

Shift and Rotate Intructions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Uses CX as count

A

Repeated String Instructions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Uses either CX or ECX as count

A

LOOP/LOOPD Instructions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

If operated in the 64-bit mode, uses RCX for the counter.

A

LOOP

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Examples of repeated string instructions

A

REP / REPE / REPNE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What does REP represent?

A

Repeat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What does REPE represent?

A

Repeat while Equal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

What does REPNE represent?

A

Repeat while Not Equal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

is a general-purpose register that holds a part of the result from a multiplication or part of the dividend before a division.

A

Data (RDX)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

32, 16, and 8 bit register reference of RDX

A

EDX; DX; DH or DL

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

points to a memory location in all versions of the microprocessor for memory data transfers.

A

Base Pointer (RBP)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

32, 16, and 8 bit register reference of RBP

A

EBP; BP; none

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

often addresses string destination data for the string instructions.

A

Destination Index (RDI)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

32, 16, and 8 bit register reference of RDI

A

EDI; DI; none

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

often addresses source string data for the string instructions.

A

Source Index (RSI)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

32, 16, and 8 bit register reference of RSI

A

ESI; SI; none

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

These registers are only found in the Pentium 4 and Core2 if 64-bit extensions are enabled.

A

R8 through R15

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

What are the special-purpose registers?

A

RIP, RSP and RFLAGS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

What are the segment registers?

A

CS, DS, ES, SS, FS, and GS

37
Q

addresses the next instruction in a section of memory defined as a code segment.

A

Instruction Pointer (RIP)

38
Q

32, 16, and 8 bit register reference of RIP

A

EIP; IP; none

39
Q

How many bit address does RIP contain at present to address a 1T flat address space?

A

40-bit address

40
Q

addresses an area of memory called the stack.

A

Stack Pointer (RSP)

41
Q

stores data through this pointer and is explained later in the text with the instructions that address stack data.

A

Stack Memory

42
Q

32, 16, and 8 bit register reference of RSP

A

ESP; SP; none

43
Q

indicate the condition of the microprocessor and control
its operation.

44
Q

32, 16, and 8 bit register reference of RFLAGS

A

EFLAGS; FLAGS; none

45
Q

What are the flag bits?

A

ID, VIP, VIF, AC, VM, RF, _ , NT, IOP1, IOP0, O, D, I, T, S, Z, _ , A, _ , P, _ , C

46
Q

holds the carry after addition or the borrow after subtraction.

47
Q

is the count of ones in a number expressed as even or odd.

A

Parity (P)

48
Q

Parity of logic 0

A

Odd Parity

49
Q

Parity of logic 1

A

Even Parity

50
Q

holds the carry (half-carry) after addition or the borrow after subtraction between bit positions 3 and 4 of the result.

A

Auxiliary Carry (A)

51
Q

shows that the result of an arithmetic or logic operation is
zero.

52
Q

holds the arithmetic sign of the result after an arithmetic
or logic instruction executes.

53
Q

Sign bit if S = 1

A

set or negative

54
Q

Sign bit if S = 0

A

cleared or positive

55
Q

enables trapping through an on-chip debugging
feature.

56
Q

T flag logic that makes the microprocessor interrupt the flow of the program on conditions as indicated by the debug registers and control registers

57
Q

T flag logic that disables the trapping (debugging) feature

58
Q

controls the operation of the INTR (interrupt
request) input pin

A

Interrupt (I)

59
Q

Status of the INTR pin when I = 1

60
Q

Status of the INTR pin when I = 0

61
Q

What controls the state of the I flag bit?

A

STI (set I flag) and CLI (clear I flag) instructions

62
Q

selects either the increment or decrement mode for the DI and/or SI registers during string instructions

A

Direction (D)

63
Q

What happens to the registers when D = 1?

A

Decremented

64
Q

What happens to the registers when D = 0?

A

Incremented

65
Q

What controls the state of the D flag bit?

A

STD (set direction) and CLD (clear direction) instructions

66
Q

indicates that the result has exceeded the capacity of the
machine.

A

Overflow (O)

67
Q

is used in protected mode operation to select the privilege level for I/O devices.

A

I/O privilege level (IOPL)

68
Q

What happens when the current privilege level is higher or more trusted than the IOPL?

A

I/O executes without hindrance

69
Q

What happens if the IOPL is lower than the current privilege level

A

interrupt occurs, causes execution to suspend

70
Q

Highest or most trusted IOPL level

71
Q

Lowest or least trusted IOPL level

72
Q

indicates that the current task is nested within
another task in protected mode operation.

A

Nested Task (NT)

73
Q

is used with debugging to control the resumption of
execution after the next instruction.

A

Resume (RF)

74
Q

selects virtual mode operation in a protected mode
system.

A

Virtual Mode (VM)

75
Q

allows multiple DOS memory partitions that are 1M byte in length to coexist in the memory system.

A

Virtual Mode System

76
Q

is used to simulate DOS in the modern Windows environment.

A

Virtual Mode (VM)

77
Q

activates if a word or doubleword is addressed on a non-word or non-doubleword boundary.

A

Alignment Check (AC)

78
Q

is a copy of the interrupt flag bit available to the Pentium– Pentium 4 microprocessors.

A

Virtual Interrupt (VIF)

79
Q

provides information about a virtual mode interrupt for the Pentium–Pentium 4 microprocessors. This is used in multitasking environments to provide the operating system with virtual interrupt flags and interrupt pending information

A

Virtual Interrupt Pending (VIP)

80
Q

indicates that the Pentium–Pentium 4 microprocessors
support the CPUID instruction.

A

Identification (ID)

81
Q

provides the system with information about the Pentium microprocessor, such as its version number and manufacturer

82
Q

generate memory addresses when combined with other registers in the microprocessor.

A

Segment Registers

83
Q

is a section of memory that holds the code
(programs and procedures) used by the microprocessor.

84
Q

is a section of memory that contains most data used
by a program.

85
Q

is an additional data segment that is used by some of the string instructions to hold destination data.

A

Extra (ES)

86
Q

defines the area of memory used for the stack.

A

Stack (SS)

87
Q

is determined by the stack segment and stack
pointer registers.

A

Stack Entry Point

88
Q

are supplemental segment registers available in the 80386–Core2 microprocessors to allow two additional memory segments for access by programs.

Microprocessors (28 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions