Register Set of 8051 MCQ’s

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This set of Microprocessor Multiple Choice Questions & Answers (MCQs) focuses on “Register Set of 8051″.

1. Which of the following register can be addressed as a byte?
a) P1
b) SCON
c) TMOD
d) TCON

2. Which of the following is bit-addressable register?
a) SBUF
b) PCON
c) TMOD
d) SCON

3. Which of the following is an 8-bit register?
a) PSW(Program Status Word)
b) TCON(Timer Control Register)
c) Accumulator
d) All of the mentioned

4. The higher and lower bytes of a 16-bit register DPTR are represented respectively as
a) LDPTR and HDPTR
b) DPTRL and DPTRH
c) DPH and DPL
d) HDP and LDP

5. Among the four groups of register banks, the number of groups that can be accessed at a time is
a) 1
b) 2
c) 3
d) all the four

6. If RS1=1, RS0=0, then the register bank selected is
a) register bank 0
b) register bank 1
c) register bank 2
d) register bank 3

7. The register that is used for accessing external data memory is
a) DPH
b) DPL
c) DPTR
d) NONE

8. The number of 8-bit registers that a register bank contain is
a) 2
b) 4
c) 6
d) 8

9. If RS1=1, RS0=1, then the register bank selected is
a) register bank 0
b) register bank 1
c) register bank 2
d) register bank 3

10. The on-chip oscillator is stopped in
a) power mode
b) power down mode
c) idle mode
d) ideal mode

11. The only way to terminate the power down mode is to
a) CLEAR
b) RESET
c) HOLD
d) HLT

12. The PCON register consists of
a) power mode bit
b) power idle bit
c) power ideal bit
d) power down bit and idle bit

13. In idle mode, the device that is disabled is
a) serial port
b) timer block
c) clock to CPU
d) all of the mentioned

14. The idle mode can be terminated by
a) PRESET
b) CLEAR
c) Interrupt
d) Interrupt or reset

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