In a given 8-bit general purpose micro-controller there are following flags. C-Carry, A-Auxiliary Carry, O-Overflow flag, P-Parity (0 for even, 1 for odd)  and  are the two general purpose registers of the micro-controller. After execution of the following instructions, the decimal equivalent of the binary sequence of the flag pattern [CAOP] will be

MOV RO,

MOV R1, +0x46

ADD R0, R1

An 8085 microprocessor accesses two memory locations (2001H) and (2002H), that contain 8-bit numbers 98H and B1H, respectively. The following program is executed:

LXI H,2001H

MVI A, 21H

INXH

ADD M

INXH

MOV M, A

HLT

At the end of this program, the memory location 2003H contains the number in decimal (base 10) form.         

An output device is interfaced with 8–bit microprocessor 8085A. The interfacing circuit is shown in figure

The interfacing circuit makes use of 3 Line to 8 Line decoder having 3 enable lines . The address of the device is

In an 8085 microprocessor, the following program is executed

Address location – Instruction

2000H              XRA A

2001H              MVI B, 04H

2003H              MVI A, 03H

2005H              RAR

2006H              DCR B

2007H              JNZ 2005

200AH              HLT

At the end of program, register A contains

In 8085A microprocessor, the operation performed by the instruction LHLD  is

A portion of the main program to call a subroutine SUB in an 8085 environment is given below.

                :

                :

              LXI        D, DISP
        LP. CALL        SUB
                :

                :

It is desired that control be returned to LP + DISP + 3 when the RET instruction is executed in thee subroutine. The set of instructions that precede the RET instruction in the subroutine are

When a “CALL” Addr” instruction is executed. The CPU carries out the following sequential operations internally:

Note:

(R) means content of register R

((R)) means content of memory location pointed to by R

PC means program counter

SP means stack pointer

In an 8085 microprocessor, the contents of the Accumulator, after the following instructions are executed will become

XRA A

MVI B F0H

SUB B

An input device is interfaced with Intel 8085A microprocessor as memory mapped I/O.   The address of the device is 2500H. In order to input data from the device to accumulator, the sequence of instructions will be

The contents (in Hexadecimal) or some of the memory locations in an 8085A based system are given below:

The contents of stack pointer (SP), program counter (PC) and (HL) are 2700H, 2100H and 0000H respectively. When the following sequence of instructions are executed,

The contents of (SP) and (PC) at the end of execution will be

Which one of the following statements regarding the INT (interrupt) and the BRQ (bus request) pins in a CPU is true?

The associated figure shows the two types of rotate right instructions R1, R2 available in a microprocessor where Reg is a 8-bit register and C is the carry bit. The rotate left instructions L1 and L2 are similar except that C now links the most significant bit of Reg instead of the least significant one.

Suppose Reg contains the 2's complement number 11010110. If this number is divided by 2 the answer should be

The associated figure shows the two types of rotate right instructions R1, R2 available in a microprocessor where Reg is a 8-bit register and C is the carry bit. The rotate left instructions L1 and L2 are similar except that C now links the most significant bit of Reg instead of the least significant one.

Such a division can be correctly performed by the following set of operations

A software delay subroutine is written as given below:        

How many times DCR L instruction will be executed?

In an 8085 microprocessor based system, it is desired to increment the contents of memory location whose address is available in (D, E) register pair and store the result in same location.  The sequence of instructions is

The 8085 assembly language instruction that stores the contents of H and L registers into the memory locations 2050H and 2051H, respectively, is:

If the following program is executed in a microprocessor, the number of instruction cycles it will take from START TO HALT is

START        MVI A, 14 H        :  Move 14 H to register A

SHIFT        RLC                        : Rotate left without carry

                JNZ SHIFT                : Jump on non-zero to

                SHIFT

                HALT

When a program is being executed in an 8085 microprocessor, its Program Counter contains

A memory system has a total of 8 memory chips, each with 12 address lines and 4 data lines. The total size of the memory system is

The following program is written for an 8085 microprocessor to add two bytes located at memory addresses 1FFE and 1FFF

LXI        H, 1FFE

MOV        B, M

INR        L

MOV        A, M

ADD        B

INR        L

MOV        M, A

XOR        A

On completion of the execution of the program, the result of addition is

The logic circuit used to generate the active low chip selects (CS) by an 8085 microprocessor to address a peripheral is shown in Figure. The peripheral will respond to addresses in the range.

An intel 8085 processor is executing the program given below.

                          MVI A, 10H

                          MVI B, 10H

BACK:            NOP

                          ADD B

                          RLC

                          JNC BACK

                          HLT

The number of times that the operation NOP will be executed is equal to

Which one of the following is not a vectored interrupt?

In a microprocessor, the address of the next instruction to be executed, is stored in

The computer program which converts statements written in high level language to object code is known as

The range of address for which the memory chip shown in figure, will be selected is_________ to_________

In a 8085 microprocessor, the following instructions may result in change of accumulator contents and change in status flags. Choose the correct match for each instruction.

In an 8085 microprocessor, after the execution of XRA A instruction  

A subroutine PROG1 written in the 8085 assembly language is given below. At entry to this program, the values of different registers in HEX are. A=05; BC=0000; DE=5472; HL=4528, All the flags are set to 1. Determine the register contents and condition of the zero and carry flags after the execution of the program. (i.e., after executing RET statement). What does the program accomplish?

PROG1        MOV A, E

        ADD L

        DAA

        MOV L, A

        MOV A, D

        ADC H

        DAA

        MOV H, A

        MVI A, 00H

        RAL

        RET

The contents of the accumulator in an 8085 microprocessor is altered after the execution of the instruction.

The stack pointer of a microprocessor is at A001 At the end of execution of following instructions, the value of stack pointer is _____________

PUSH        PSW

X        THL        

PUSH        D

JMP         FC70 H

Three devices A, B and C have to be connected to a 8085 microprocessor. Device A has highest priority and device C has the lowest priority. In this context which of the following is correct assignment of interrupt inputs?

If the HLT instruction of a 8085 microprocessor is executed,