8051 EMP-1

DPTR

• data pointer-16 bit register

• data pointer-8 bit register

• data transmitter

• data transmitter and receiver

PSW

• program status word-8 bit flag register

• program status word-16 bit flag register

• program signal word

• priority signal word

8051 internal ROM size

• 2kb

• 4kb

• 1kb

• 5kb

8051 series has how many 16 bit registers?

• 2

• 3

• 1

• 0

When 8051 wakes up then 0x00 is loaded to which register?

• PSW

• SP

• PC

• None of the above

How are the status of the carry, auxiliary carry and parity flag affected if the write instruction
MOV A,#9C    ADD A,#64H

• CY=0,AC=0,P=0

• CY=1,AC=1,P=0

• CY=0,AC=1,P=0

• CY=1,AC=1,P=1

 How are the bits of the register PSW affected if we select Bank2 of 8051?

• PSW.5=0 and PSW.4=1

• PSW.2=0 and PSW.3=1

• PSW.3=1 and PSW.4=1

• PSW.3=0 and PSW.4=1

If we push data onto the stack then the stack pointer

• 
  increases with every push

• decreases with every push

• 
  increases & decreases with every push

• none of the mentioned

On power up, the 8051 uses which RAM locations for register R0- R7

• 
   00-2F

• 00-07F

• 
   00-7F

• 
  00-0F

How many bytes of bit addressable memory is present in 8051 based microcontrollers?

• 
  8 bytes

• 32 bytes

• 
  16 bytes

• 128 bytes