8051 microcontroller basics

Full form of PSW?

• Program Settle word

• Program Screen word

• Program Status Word

ROM memory size placed on chip?

• 64Kbytes

• 4Kbytes

• 256 Bytes

• 128 bytes

How many timers are present in 8051

• 2

• 4

• 1

Is Port 0 is Special Function Register?

• TRUE

• FALSE

How many SFR registers are present in memory

• 10

• 12

• 11

• 21

what is PROGRAM COUNTER (PC)?

• holds the address of memory,where next executable instruction placed

• holds the data of memory

• 16- bit register

• it is a memory pointer

which port is used only for INPUT/OUTPUT operation?

• PORT 0

• PORT 1

• PORT 2

• PORT 3

PIN number of Vcc (supply)?

• 1

• 20

• 40

• 10

8051 microcontroller has ONE or TWO bit handling instrucions?

• FALSE

• TRUE

 $\overline{EA}$  is held _____ , to access external ROM

• HIGH

• LOW