Embedded And Real Time System Set 3

Electrical Engineering

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This set of Embedded and Real Time System Multiple Choice Questions & Answers (MCQs) focuses on Embedded And Real Time System Set 3

Q1 | The additional duplicate register used in ARM machines are called as                
  • copied-registers
  • banked registers
  • extra registers
  • extential registers
Answer: banked registers
Explaination:
the duplicate registers are used in situations of context switching.
Q2 | The banked registers are used for              
  • switching between supervisor and interrupt mode
  • extended storing
  • same as other general purpose registers
  • none of the mentioned
Answer: switching between supervisor and interrupt mode
Explaination:
when switching from one mode to another, instead of storing the register contents somewhere else it’ll be kept in the duplicate registers and the new values are stored in the actual registers.
Q3 | Each instruction in ARM machines is encoded into                      Word.
  • 2 byte
  • 3 byte
  • 4 byte
  • 8 byte
Answer: 4 byte
Explaination:
the data is encrypted to make them secure.
Q4 | All instructions in ARM are conditionally executed.
  • true
  • false
Answer: true
Explaination:
none.
Q5 | The addressing mode where the EA of the operand is the contents of Rn is              
  • pre-indexed mode
  • pre-indexed with write back mode
  • post-indexed mode
  • none of the mentioned
Answer: post-indexed mode
Explaination:
none.
Q6 | The USB controller provides high speed interface to laptop/PC with a speed of
  • on-chip usb with 12mb/s
  • on-chip usb with 15mb/s
  • peripheral usb with 12mb/s
  • peripheral usb with 15mb/s
Answer: on-chip usb with 12mb/s
Explaination:
the on-chip usb controller
Q7 | Xbee/Bluetooth/Wifi wireless modules and SD/MMC card are included in the board?
  • true
  • false
Answer: false
Explaination:
xbee/bluetooth/wifi wireless modules and sd/mmc card are not included in the board and it can be separately brought from net robotics website.
Q8 | In LPC 2148 we require separate programmer?
  • true
  • false
Answer: false
Explaination:
the uart boot loader eliminates the need of an additional programmer and allows you to program using serial port.
Q9 | Which LCD display is present in LPC 2148 Development Board?
  • 8*8 led
  • 2*32 lcd
  • 2*16 lcd connected peripherally
  • 2*16 lcd on-chip
Answer: 2*16 lcd on-chip
Explaination:
on-board two line lcd display (2*16) with jumper selection option to disable lcd when not required.
Q10 | Does it have in system programming or in application programming?
  • true
  • false
Answer: true
Explaination:
in system programming is generally what we do, i.e., using jtag the program is dumped in to the board.
Q11 | It provides real time debugging with the on chip real monitor software.
  • true
  • false
Answer: true
Explaination:
embedded ice rt and embedded trace interfaces offer real-time debugging with the on chip real monitor software and high speed tracing execution.
Q12 | Who is the founder of LPC2148 board?
  • intel
  • atmel
  • motorola
  • philips
Answer: philips
Explaination:
arm lpc2148 is arm7tdmi-s core board microcontroller that uses 16/32-bit 64 pin(lqfp) microcontroller no.lpc2148 from philips(nxp).
Q13 | What is the program counter value when the board turns on?
  • 0x00000
  • 0xfffff
  • where the previous program ends
  • at the location where we write the code
Answer: 0x00000
Explaination:
usually the program counter will store the address of the instruction to be
Q14 |                  bit ARM7TDMI controller is present?
  • 128 bit
  • 8 bit
  • 64 bit
  • 32 bit
Answer: 32 bit
Explaination:
lpc 2148 pro development board is a powerful development platform based on lpc2148 arm7tdmi micro controller with 512k on-chip memory. with a 16-bit/32-bit arm7tdmi-s microcontroller is a tiny lqfp64 package.
Q15 | USB 2.0 full speed compliant device controller with                    of end point RAM.
  • 6 kb
  • 4 kb
  • 2 kb
  • 8 kb
Answer: 2 kb
Explaination:
the on-chip usb controller provides direct high speed interface to a pc/laptop with speeds up to 12 mb/s. usb
Q16 | What is the operating voltage of the board?
  • 5v
  • 2.5v
  • 3v
  • 4.5v
Answer: 3v
Explaination:
single power supply with por and bod circuits and operated at the supply voltage of 3.0 to 3.6v with 5v tolerant i/o pads.
Q17 | What does UART stand for?
  • universal asynchronous receiver transmitter
  • unique asynchronous receiver transmitter
  • universal address receiver transmitter
  • unique address receiver transmitter
Answer: universal asynchronous receiver transmitter
Explaination:
the uart or universal asynchronous receiver transmitter is used for the data transmission at a predefined speed or baud rate.
Q18 | How is data detected in a UART?
  • counter
  • timer
  • clock
  • first bit
Answer: clock
Explaination:
the data can be detected by the local clock reference which is generated from the baud rate generator.
Q19 | Which of the signal is set to one, if no data is transmitted?
  • ready
  • start
  • stop
  • txd
Answer: txd
Explaination:
the txd signal goes to logic one when no data is transmitted. when data transmit, it sets to logic zero.
Q20 | What rate can define the timing in the UART?
  • bit rate
  • baud rate
  • speed rate
  • voltage rate
Answer: baud rate
Explaination:
the timing is defined by the baud rate in which both the transmitter and receiver are used. the baud rate is supplied by the counter or an external timer called baud rate generator which generates a clock signal.
Q21 | How is the baud rate supplied?
  • baud rate voltage
  • external timer
  • peripheral
  • internal timer
Answer: external timer
Explaination:
the baud rate is supplied by the counter or an external timer called baud rate generator which generates a clock signal.
Q22 | Which company developed 16450?
  • philips
  • intel
  • national semiconductor
  • ibm
Answer: national semiconductor
Explaination:
the intel 8250 is replaced by the 16450 and 16550 which are developed by the national semiconductors. 16450 is a chip which can combine all the pc’s input output devices into a single piece of silicon.
Q23 | What does ADS indicate in 8250 UART?
  • address signal
  • address terminal signal
  • address strobe signal
  • address generating signal
Answer: address strobe signal
Explaination:
the ads is address strobe signal and is working as active low in 8250 uart. the ads signal is used to latch the address and chip select signals while processor access.
Q24 | Which of the following signals are active low in the 8250 UART?
  • baudout
  • ddis
  • intr
  • mr
Answer: baudout
Explaination:
the baudout signal is active low whereas ddis, intr and mr are active high in the 8250 uart. baudout is the clock signal from the transmitter part of the uart. ddis signal goes low when the cpu is reading data from the uart. intr is the interrupt pin. mr is the master reset pin.
Q25 | Which of the signal can control bus arbitration logic in 8250?
  • mr
  • ddis
  • intr
  • rclk
Answer: ddis
Explaination:
ddis signal goes low when the cpu is reading data from the uart and it also controls the bus arbitration logic.
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