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Microcontrollers Questions Set 4:

Quiz Mode

Which register is responsible for enabling and disabling interrupts?

IPE

Solution:

The register that can be used as a scratch pad is

Accumulator

B register

Data register

Accumulator and B register

Solution:

A 8051 microcontroller has inputs 1101 1011 to the TMOD registers, then which timer will act as counter ?

Timer 0

Timer 1

both

none

Solution:

If the LSB of the TCON register is set then then which part of the microcontroller is not synchronized ?

CPU

timers

serial ports

none

Solution:

Calculate the timer's clock frequency for the AT89C51 controller, with an XTAL frequency of 22 MHz.

1.085 MHz

1 MHz

921.6 KHz

1.833 MHz

Solution:

For an interrupt to be guaranteed to be served, it should have a duration of how many machine cycles?

1 machine cycle

2 machine cycles

3 machine cycles

4 machine cycles

Solution:

Which of the following code will check whether the D0 bit of register R2 is high or low?

MOV A, R2 JBC ACC.1

MOV A, R2 JNC ACC.0

MOV A, R2 JNB ACC.0

MOV A, R2 JNB ACC.1

Solution:

Which addressing mode in 8051 is used with absolute jump (AJMP) and absolute call (ACALL) instructions?

Absolute addressing mode

Immediate addressing mode

Direct addressing mode

Indirect addressing mode

Solution:

Which port in 8051 microprocessor has no alternate functions and is only dedicated to input and output?

Port 0

Port 1

Port 2

Port 3

Solution:

The above program is written in order to multiply the numbers B2H and 2FH. According to the program, in which registers are the LSB and MSB of the result stored?

LSB is stored in R1 and MSB is stored R0 of Bank 2

LSB is stored in R1 and MSB is stored R2 of Bank 2

LSB is stored in R1 and MSB is stored R0 of Bank 3

LSB is stored in R0 and MSB is stored R1 of Bank 2

Solution:

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Microcontrollers Questions Set 4:

Which register is responsible for enabling and disabling interrupts?

Solution:

The register that can be used as a scratch pad is

Solution:

A 8051 microcontroller has inputs 1101 1011 to the TMOD registers, then which timer will act as counter ?

Solution:

If the LSB of the TCON register is set then then which part of the microcontroller is not synchronized ?

Solution:

Calculate the timer's clock frequency for the AT89C51 controller, with an XTAL frequency of 22 MHz.

Solution:

For an interrupt to be guaranteed to be served, it should have a duration of how many machine cycles?

Solution:

Which of the following code will check whether the D0 bit of register R2 is high or low?

Solution:

Which addressing mode in 8051 is used with absolute jump (AJMP) and absolute call (ACALL) instructions?

Solution:

Which port in 8051 microprocessor has no alternate functions and is only dedicated to input and output?

Solution:

The above program is written in order to multiply the numbers B2H and 2FH. According to the program, in which registers are the LSB and MSB of the result stored?

Solution:

Related Question Sets:

Related Topics: