BAPATLA ENGINEERING COLLEGE :: BAPATLA
DEPARTMENT OF ECE

GATE – 2010

MICROPROCESSORS AND INTERFACING

Faculty: Sri A.M.V.N.Maruthi

1) The width of address bus and data bus in 8085 are respectively…

a) 16,8 b)8,16

c) 8,8 d) 16,16

2) The number of status flags in 8085 are

a) 5 b) 6

c)9 d)8

3) The status that cannot be operated by direct instructions is

a) Cy b) Z

c) P d) AC

4) The number of software interrupts in 8085 is…

a) 5 b) 8

c) 9 d) 10

5) Identify the non maskabe interrupt in the following

a) RST4.5 b) RST5.5

c) RST6.5 d) RST 7.5

6) If the …show more content…
MVI H, 01FFH

SHLD 2050H

After execution the contents of memory loction 2050H,2051H and registers H,L will be

respectively…

a)00H,01H,FFH,FFH b)FFH,01H,FFH,01H

c) FFH,01H,01H,FFH d)01H,FFH,FFH,FFH

36) Consider the following set of 8085 instruction.

MVI A,82H

ORA A

JP DSPLY

XRA A

DSPLY:OUT PORT1

HLT.

The output at PORT1 is

a)00h b)FFH

c)92H d)11H

37) After the execution of following instructions, contents of PC and HL are…

LXI H, 30A0

DAD H

PCHL

a) PC=2715H HL=30A0H b) PC=30A0H, HL=2715H

c) PC-6140H, HL=6140H d) PC=6140H, HL=2715H

38)If the following program starts at 0100H, the contents of accumulator when PC reaches

0109H…

LXI SP, 00FFH

LXI H, 0107H

MVI A, 20H

SUB M

a)20H b)02H

c)00H d)FFH

39) Let the contents of B register and accumulator are 49h and 3AH respectively. The contents

of accumulator, status of carry flag and sign flag are..