Microprocessor Practice Test 10

1. The power control register is

non-bit addressable register

all of the mentioned

used for eventual power off to 8051 chip

used for power saving during idle state

2. Which of the following is not an unconditional control transfer instruction?

JMP

JNC

CALL

RET

3. The storage of addresses that can be directly accessed is

external data RAM

external data ROM and SFRS

internal data ROM

internal data RAM and SFRS

4. The device that is used for deriving chip select signals is

All of the mentioned

Multiplexers

PLAs and EPROMs

Logic gates

5. The number of bytes stored on the stack during one operation of PUSH or POP is

6. To convert its current output into a voltage, the DAC 0808 is connected with

OPAMP internally

FET externally

OPAMP externally

Transistor(BJT) externally

7. The LJMP instruction is very useful in programming in the external code memory space of

32 KB

32 MB

64 KB

64 MB

8. The configuration in which each LED receives operating current of 8 mA from power supply while the port lines sink the current on each port line is

common cathode configuration

common anode configuration

none of the mentioned

common port configuration

9. The instruction, RLA performs

rotation of accumulator to right

rotation of accumulator to left

rotation of address register to right

rotation of address register to left

10. The step involved in PUSH operation is

store 8-bit content to address pointed to by SP and then increment stack by 1

increment stack by 1 and store 8-bit content to address pointed to by SP

increment stack by 2 and store 8-bit content to address pointed to by SP

decrement stack by 1 and store 16-bit content to address pointed to by SP