8051 Assembly Language

What is the job of instruction

CPL 0E0

• Will Complement Accumulator

• Will Complement 0th bit of Accumulator

• Will Clear Accumulator

• Will Clear 0th bit of Accumulator

In multi byte addition to add the higher bytes we can use

• ADD

• ADDC

• ADDH

• ADDL

Which of the following is not a bit jump instruction

• JB

• JC

• JNC

• JZ

Which is not a valid instruction?

• CJNE

• CJNZ

• DJNZ

• JZ

How many bits are used for address field in AJMP

• 8 Bits

• 16 Bits

• 11 Bits

• 10 Bits

What is the range of short jump

• -128 to 127

• -127 to 128

• -128 to 128

• -127 to 127

What is the use of DA A

• to find the binary equivalent of the content inside A

• to adjust the result of arithmetic operation into BCD

• Decrement A

• to add to BCD numbers

Which one of the following is not a valid Instruction

• ADD A, @R1

• ADD A, #45

• MUL A,B

• SUBB A,R1

RRC A Instruction performs

• 8 Bit Rotation

• 9 Bit Rotation

• 7 Bit Rotation

• RRC in not a Rotation Instruction

Over flow flag is set for the following condition

• Carry from Bit 7

• Carry from bit 7 as well as from bit 6

• Carry from Bit 7 and no carry from bit 6

• None of the above