8051 Register Set MCQs : This section focuses on the "8051 Register Set". These Multiple Choice Questions (MCQs) should be practiced to improve the 8051 Register Set skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
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
Question 2
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
Question 3
In idle mode, the device that is disabled is
A. serial port
B. timer block
C. clock to CPU
D. all of the mentioned
Question 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
Question 5
The idle mode can be terminated by
A. PRESET
B. CLEAR
C. Interrupt
D. Interrupt or reset
Question 6
The number of 8-bit registers that a register bank contain is
A. 2
B. 4
C. 6
D. 8
Question 7
The on-chip oscillator is stopped in
A. power mode
B. power down mode
C. idle mode
D. ideal mode
Question 8
The only way to terminate the power down mode is to
A. CLEAR
B. RESET
C. HOLD
D. HLT
Question 9
The PCON register consists of
A. power mode bit
B. power idle bit
C. power ideal bit
D. power down bit and idle bit
Question 10
The register that is used for accessing external data memory is
A. DPH
B. DPL
C. DPTR
D. NONE
Question 11
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
Question 12
Which of the following is bit-addressable register?
A. SBUF
B. PCON
C. TMOD
D. SCON
Question 13
Which of the following register can be addressed as a byte?
A. P1
B. SCON
C. TMOD
D. TCON
Question 14
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