Microcontroller 8051

Full form of DJNZ ?

• Decrease Just Number Zero

• Decrement Jump Not equal to Zero

• Data Jump New address if Zero

• Delete and Jump to Number Zero

full form of DJNZ ?

• Decrease Just Number Zero

• Decrement Jump Not equal to Zero

• Data Jump New address if Zero

• Delete and Jump to Number Zero

After execution of following instructions what will be content of Accumulator ? And also tell which flag will set?

MOV A,#08H

MOV B,#09H

ADD A,B

• 12H, CY

• 11H, CY

• 11H , AC

• 12H, AC

How to select register register bank 2 ?

• SETB RS1 , SETB RS0

• CLR RS1 , SETB RS0

• SETB RS1 , CLR RS0

• CLR RS1 , CLR RS0

Number of binary 1's in accumulator is odd then parity bit of PSW will be __________

• SET

• RESET

• -

• NONE OF THIS

Which register bank will select after

CLR PSW.4

SETB PSW.3

• 3

• 2

• 1

• 0

Special function Register (SFR) address of B register is ______________________

• A0 H

• B0 H

• E0 H

• F0 H

Find content of Accumulator ?

MOV A , #4EH

CPL A

A = ?

• 22H

• B1H

• 21H

• 24H

Find CY = ?

MOV A , # 09H

RRC A

• 0

• 1

• NONE OF THIS

how many I/O port lines are there?

• 4

• 8

• 16

• 32