In $8051$ microcontroller external code$/$data memory can be selected using pin?

EA

PSEN

PROG

ALE

Instruction $$MOV TMOD, #$00100011$B$$ results to Timer $1$ which mode of operation?

$1$

$2$

$3$

$0$

Assume that we need to build $4$Mx$16$ main memory using $256$Kx$8$ RAM chips. How many RAM chips needed to design main memory?

$8$

$16$

$32$

$64$

MOV r$0,$ #FFH

Back: DJNZ r$0,$ back

ret

The above program requires how many machine cycles for its execution?

$5$

$513$

$258$

$3$

The $1$ MB byte is$$ divided into $4$ segment, then each segment size will be $?$

$1$ Kbyte

$64$ Kbyte

$33$ Kbyte

$34$ Kbyte

The pin of minimum mode AD$0-$AD$15$ has address

$16$ bit

$20$ bit

$32$ bit

$4$ bit

Suppose R$0=2$EH$,$ A$=$F$3$H and internal RAM location $2$EH$=76$H$.$ If the following $8051$ instruction is executed

XCH$$ A$,$ @R$0$

What will be the value of A and RAM Location $2$EH$?$

A $=$ F$3$H and $2$EH $=76$H

A $=$ F$6$H and $2$EH $=7$FH

A $=76$H and $2$EH $=$ F$3$H

A $=73$H and $2$Eh $=$ F$6$H

$\_\_\_\_\_$PIN is used to write into memory or in IO

RD

WR

RD $/$ WR

CLK

In Mode $0$ of Timer $1$ for a delay of $1$ms what is the value to be loaded in TH$1?$

$14$H

E$3$H

$1$CH

$74$H

High priority interrupt from the below is$?$

TF$0$

INT$1$

TF$1$

INT$0$

What is the duration of one machine cycle if the clock frequency of $8051$ is $20$ MHz$?$

$0\mathrm{.}4$ micro sec

$0\mathrm{.}5$ micro sec

$0\mathrm{.}6$ micro sec

$2\mathrm{.}0$ micro sec

MOV TMOD, #$01$H

MOV TL$0,$ #aH

MOV TH$0,$ #bH

SETB TR$0$

Back: JNB TF$0,$ Back

CLR TR$0$

CLR TF$0$

RET

In the above program for a delay of $5$ms what are the values of a and b$?$

$00$ and EE

EE and $00$

$0$E and $0$E

E$0$ and E$0$

The translates a byte from one code to another code

XLAT

XCHNG

POP

PUSH

The conditional branch instruction specifies for branching

conditions

instruction

address

memory

Flag register is also known as$?$

current registerr

PSW

Result register

NOne

Instruction providing both segment base and offset address are called

below type.

far type

low type

high type

The BIU contains FIFO register of size $6$ bytes called.

queue

stack

segment

register

The $8086$ fetches instruction one after another from of memory

code segment

IP

ES

SS

Which software development tool converts high level language program to machine language program?

assembler

linker

loader

compiler

The functions of Pins from $24$ to $31$ depend on the mode in which is operating

$8085$

$8086$

$80835$

$80845$

Other:

Assume that, DS$=1000$H$,$ SS$=2000$H$,$ BX$=0500$H$,$ BP$=0600$H$,$ SI $=3000$H$,$ DI $=4000$H$.$

Compute the physical address of memory operand of the below instruction:

MOV CL$,[$BP $+$ DI$]$

$23600$H

$14500$H

$24600$H

$13500$H

Assume that DS $=$ FF$00$H in $8086$ microprocessor. What will be the data segment physical address range?

$00000$H to FFFFFH

FFF$00$H to FFFFFH

FF$000$H to FFFFFH

F$0000$H to FFFFFH

Which segment registration will be used by $8086$ during string destination operation?

ES

CS

DS

SS

The RD$,$ WR$,$ M$/$IO$\text{'}$is the heart of control for a mode

minimum

maximum

compatibility mode

control mode

The JS instruction in $8086$ is called as

jump the signed bit

jump single bit

jump simple bit

jump signal it

MOV A$,$ @R$0$ results a value in A when R$0=20$H and the value in address $20$H as $10$H

$20$H

$20$

$10$H

$10$

MOV r$0,$ #$200$

Back: DJNZ r$0,$ back

ret

In Atmel $8051,$ the above program requires how much time for its execution?

$3\mathrm{.}255$s

$5\mathrm{.}425$s

$437\mathrm{.}255$s

$220\mathrm{.}255$s

Which instruction is to be used to perform BCD addition? Select appropriate instruction.

MOV AL$,35$H

MOV BL$,36$H

$???$

DAA$$

ADD BL$,$ AL

ADD AL$,$ BL

ADD AX$,$ BX

ADD BX$,$ AX

which of the following will contains an offset instead of actual address

SP

IP

ES

SS

The pin of minimum mode AD$0-$ AD$15$ has $\_$ data bus

$4$ bit

$20$ bit

$16$ bit

$32$ bit