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..