Q:
Why RETI instruction is used after an ISR?
belongs to collection: COMPUTER ARCHITECTURE - MICROCONTROLLER MCQ
COMPUTER ARCHITECTURE - MICROCONTROLLER MCQ
- Unlike micro processors, micro controllers make use of batteries because they have:
- What is the order decided by a processor or the CPU of a controller to execute an instruction?
- How are micro controllers classified on the basic of internal bus width?
- How is the performance and the computer capability affected by increasing its internal bus width?
- Abbreviate CISC and RISC
- Give the names of the buses present in a controller for transferring data from one place to another?
- What is the file extension that is loaded in a micro controller for executing any instruction?
- What are the most appropriate criterion for choosing the right micro controller of our choice?
- Why micro controllers are not called general purpose devices?
- MAX1112 is a _________ type of ADC converter?
- Why do we connect a capacitor between the Vref and the Gnd pin?
- Which of the following are the registers that are used for controlling the ADC conversion in the AVR?
- What is the internal Vref of an Atmega32 series?
- The output of a DAC0808 is in form of
- In a DAC the input is ______ and the output is ______
- A micro controller at-least should consist of:
- How many types of architectures are available, for designing a device that is able to work on its own?
- Which architecture is followed by general purpose microprocessors?
- Which architecture involves both the volatile and the non volatile memory?
- Which architecture provides separate buses for program and data memory?
- Which micro controller don’t match with its architecture below?
- Harvard architecture allows:
- Which out of the following supports Harvard architecture?
- Why most of the DSPs use Harvard architecture?
- Which of the following supports CISC as well as Harvard architecture?
- Which of the two architecture saves memory?
- Is the following instruction correct LDI R3,50?
- Registers R0-R31 are used for what type of works?
- Largest value that can be loaded in an 8 bit register is?
- The total space for the data memory available in the AVR based micro controller is?
- Which out of the following instructions don’t affect the flags of the status register?
- What is the difference between the two given instructions?
- Which out of the following is not a directive?
- Is an assembly language a high level language?
- A 14 bit program counter can execute a maximum of _________ memory locations?
- When AVR wakes up, then the value of PC becomes?
- Which of the following is correct about BRNE instruction in avr microcontrollers?
- How many times is this loop going to get execute?
- Which of the below mentioned are not the conditional jumps?
- What is the relation between the target and the relative address?
- In the JMP instruction how many bits are their for determining the target address?
- Which of the following statements is/are correct?
- Which of the following is used to represent the last RAM address?
- Which of the following statements are correct about the RCALL instruction?
- On power on SP points to the address?
- Which of the following statements is true?
- In AVR, which registers are there for the I/O programming of ports?
- The data will not go from the port registers to the pin unless:
- On reset DDR registers of all ports are set to:
- All series of AVR has 8 pins in all of their ports?
- Which of the following is not a single bit instruction in AVR?
- Which of the following is correct about the SBIS instruction?
- Instruction CBI PORTB,1 means
- Which of the following instruction can used to toggle a bit of the PORT?
- What is the main function of the SBIC instruction?
- In AVR micro controllers, ADD instruction affects the status of which of the following bits of a status register?
- ADC instruction is used for?
- AVR supports which of the following mentioned subtraction instructions?
- What steps are involved when we subtract two numbers present at two different locations?
- In executing subtraction based instructions, state the role of the C flag?
- Which of the following is correct about the MUL instruction?
- In AVR, when is the V flag set?
- To set the bits of a register R1 to 1, we must OR the contents of the register with?
- CP instruction alters the value of the register?
- What is right about the ROR instruction?
- In AVR, which of the following registers are not used for programming timers?
- What is the use of the prescalar in the operation of the timer?
- What modes are generally used in the operation of the timer0?
- Timer 0 can act as a counter
- Which of the timer can operate in the 16 bit condition?
- Which of the following will generate the maximum time delay?
- What is the difference in operation of a normal and a CTC mode of a timer?
- We can count the pulses on the positive or the negative edge triggered pulse of the clock?
- Which pin is used for the input clock of the counter0?
- Which resource provides clock pulse to AVR timers if CS02-00=6?
- On reset, what are the contents of the SREG register?
- TIMSK register is used for?
- Why RETI instruction is used after an ISR?
- In AVR what is the ISR address for an external hardware interrupt?
- What is the address in the interrupt service routine assigned for the timer0 overflow flag?
- Is the same address is assigned for the timer0 and timer1 overflow flag in the interrupt vector table of the interrupts?
- External hardware interrupts are assigned to which pins of the atmega32?
- Which register is responsible for handling all the external hardware interrupts?
- By default, INT0-INT2 interrupts are?
- What will happen in that condition, if an interrupt occurs while the micro controller is serving any other interrupt?
- What actually are the DB9, DB25 ports available in our computers?
- What does RI handshaking signal refer to according to the RS232 logic?
- What is the major difference between a MAX232 and a MAX233 device?
- Which of the following is correct about the baud rate during serial transmission?
- With fosc= 8 MHz, what will the count that has to filled in the UBRR register to account for the 9600 baud rate?
- The USART in AVR based micro controllers operate at which of the following modes?
- Which bit of the UCSRA is used for doubling the baud rate of the transmission?
- What is the use of the PE and the FE bits of the UCSRA register?
- Which of the following bits are used for setting the data frame size?
- Which of the following parameters should the transmitter and the receiver agree upon before starting a serial transmission?
- In AVR, the LCD operates in two main modes, it can be in 8 bit or 4 bit data
- What can be the sequence of commands that may be used for initializing an LCD?
- When the LCD operates in the 4 bit mode, then what more commands are added to it?
- What is the main function of the LPM instruction used in LCD?
- The RS pin acts as an
- To latch in information at the data pins of the LCD, we send
- What is the function of the 0x06 command?
- What is the address of the second column and the second row of the 2*20 LCD?
- Which of the following commands takes more than 100 microseconds to run?
- For selecting the data pins in a LCD, RS pin should be
- In reading the columns of a keyboard matrix, when no key is pressed then all the pins show
- To see if any key is pressed, all rows are grounded
- Identify the row and the column for the following case when for the row D3-D0= 1110 and for the column D3-D0= 1101
- What are the actual steps that are followed in identifying any key that is being pressed?
- To identify that the key is present in which row and the column
- The key detection and the key identification are two different procedures?
- What is described by the following command?
- If the pins of the keyboard are used as an interrupt, then these pins will cause interrupt of what type?
- What will happen if two keys of the keyboard are pressed at a time?
- Why initially all keys are considered open before detecting the key pressed?
- Which of the following is correct about the word resolution in ADC DAC converters in AVR’s?
- In an ADC, we can calculate the output voltage from the formula
- ADC0848 is a ____________ bit converter?
- Which of the following factors can affect the step size calculation?
- Which of the following is correct about the word sensors?
- Why do we need to apply the concept of signal conditioning to a sensor?
- Which of the following is correct about LM35 based sensors?
- What is the difference between the LM34 and the LM35 based sensors?
- Every transducer must be connected with the signal conditioning circuit?
- LM35 provides _______ V for each degree count?
- Why for the 8 bit analog input we select Vref as the 2.56V?
- What is the temperature for LM35 sensor if the analog output is 0011 1001?
- In an external hardware, their are how many pins available for the LM35 and the LM34 based sensors?
- Do LM34 and LM35 based sensors have linear output?
- 8255 is a ____ pin IC
- 8255 has handshaking capability?
- The 8255 can be programmed in any of the
- RTC is used for
- RTC chips use______to compute time, date when the power is off
- DS12887 is known for as a
- DS1307 is a parallel RTC with I2C bus
- DS1307 is a _______ pin IC and operates on_______ clock frequency
- Vbat requires a positive signal of
- SQW(pin no 7) is an
- DS1307 has a total of _______ bytes of RAM space?
- DS1307 control register has an address of
- What does the CH bit of the DS1307 demonstrate?
- Why are relays used for driving the motors?
- Why are ULN2803 normally used between the micro controllers and the relays?
- Why are opto isolators normally used between the micro controllers and the ULN2803?
- Which of the following is a type of a electromagnetic relay?
- Reed switches show connectivity whenever they are in the presence of an electrical field?
- Which of the following is an application of stepper motors?
- What are normal 4 step sequence of a stepper motor if we start to move in clockwise direction with 0110 value?
- What is the meaning of a step angle?
- For a normal 4 step sequence, what are number of teeth required to accomplish a 2 degree step angle?
- Ounch-inch is a unit of a torque
- Why do we make the connection of the SCLK for communicating serially between two devices?
- What is the function of the CE pin in SPI?
- Which of the following is correct?
- If CPHA= 0 and CPOL=1, then which of the following is true?
- In SPI write, LSB goes first?
- In AVR, which of the following registers are used for SPI?
- How do we set the SPI, to operate in the master mode 1?
- SPI can act as a half duplex transmission?
- Which frequency is not recommended for SPI clock?
- To select the value of the clock to be fosc/16, what are the appropriate values?
- Which of the following is correct?
- Which of the following is true about the I2C protocols?
- I2C is a connection oriented communication protocol
- The STOP condition is generated by a
- For receiving the acknowledgement
- What steps are followed to complete the data transfer?
- I2C is ideal for short distances?
- Which of the following is a register used for programming AVR’s I2C module?
- Which bit is polled to know that whether the TWI is ready or not?
- Is status flag important in multi master systems?
- The status register in MSP430 consists of
- Which of the following bits is a bit of the status register that allows the micro controller to operate in its low power mode?
- What is actually done to improve the efficiency of a RISC processor?
- To improve the efficiency of a MSP430 based micro controller, for one register
- Their are_______________ number of emulated instructions found in the MSP430?
- w form is used for operations
- Pre increment addressing is available in MSP430?
- Which out of the following is a correct emulated instruction?
- dadd instruction can act as
- Which of the following instructions do not affect the status bits?
- Their are _____ number of addressing modes found for the source and _____ number of modes for the destination part?
- MSP430 describes reti instruction as
- Indexed addressing can be used for
- What do you understand form this instruction mov.w X(PC), R6
- Absolute mode uses which of the following operators?
- Indirect register mode is used by
- Indirect mode and the indirect auto increment mode have which common operator in them
- Are the two instructions similar
- mov.w @PC+,R6 is a type of
- ret instruction is used for
- According to conventions being followed, R12 to R15 are used for
- We can store the temporary results across a call instruction with the help of which of the following registers
- Can we allocate variables on the stack?
- Which registers are reserved for passing the parameters to a subroutine and then returning the final result?
- What actually is the order of stack frame for a parameter to pass to a subroutine?
- When any subroutine is called, then the first value of stack will be
- After subroutine which of the instruction is used for returning the pointer back to the main program?
- Is the approach of making subroutines effective or not?
- MSP430 uses vectored interrupts?
- Which of the following is true?
- After interrupt has occurred, the stack is filled with
- What is the function of __ __interrupt keyword
- What is the difference between the INTVEC and the RSEG keywords?
- For enabling any interrupt, firstly
- Non mask able vectors are stored at different vector locations?
- Which of the following can generate a non mask able interrupt?
- External RST/NMI pin is a non maskable interrupt?
- How many cycles are used by MSP430, when reti instruction is executed?
- Their are how many MSP430’s low power modes available in the chip?
- Which of the following are the low power modes?
- Which of the following modes is also known as the RAM retention mode?
- Waking a device simply means that switching that device’s operation from a low power mode to an active mode
- When an interrupt is accepted, the contents of the status register are
- MCLK must first be started
- _ _low_ power_mode_0() states the processor to
- More power can be saved by using low_power mode 0 than low_power mode 3
- _BIC_SR_IRQ() is used to
- The only clock that runs in the LPM3 is the
- Which of the following functions is not related to port P1?
- A pull-up or pull-down resistor
- P1.3 is the
- What actually is SD16_A?
- P1IE and P1IES are registers that are used to
- Unused pins must never be left unconnected in their default state as inputs
- Which of the following is an effect of a Schmidt trigger?
- To ensure that a negative fluctuation does not trigger an unwanted downward transition by pulling the input down through VIT−, we must choose
- The SPDT switch can be used as a
- Debouncing can be carried out at a hardware as well as the software end?
- What are the basic functions of a timer?
- Most of the MSP430’s devices have __________ number of timers in it?
- A Watchdog Timer can act as an interval timer?
- Which out of the following is the main function of a Watchdog timer?
- Basic Timer1 can provide
- LCD_A controllers make use of the Basic Timer1 timer for providing a clock to the LCD?
- Real time clock is an extension of Basic Timer1?
- Timer_A can be used to
- Time stamp inputs can be measured by a Timer_A?
- Timer_B includes
- The watchdog counts up and resets the MSP430 when it reaches the limit?
- Which of the following is correct about WDTCTL?
- WDTNMI is found in the
- Which of the following bits reads 0 under normal conditions but goes 1 when it wants to initiate some action?
- WDTISx bits control the
- The process of setting the WDTCNTCL bit in WDTCTL is through
- What is the function of this instruction “WDTCTL = WDTPW | WDTCONFIG”, where **#define WDTCONFIG (WDTCNTCL|WDTSSEL)**
- Is this instruction correct?
- Setting the WDTTMSEL bit of the WDTCTL register makes the watchdog timer act as
- WDTIFG flag gets cleared if
- Which of the following is true about the BTFRFQx bits of the BTCTL register?
- Timer1 is responsible for
- For fACLK = 32 KHz, what would be the desirable range of flcd?
- Normally BTCNT1 only function is to provide a prescalar for the BNTCNT2?
- BTCNT2 provides 2 output signals?
- RTCSEC, RTCMIN, RTCDOW etc. are the bytes of a set of registers that are used to store
- The RTC module is configured in the calendar mode if
- THE RTC module makes use of the Basic Timer1 because
- IF RTCIE interrupt is generated then
- What does the RTCTEVx bits do?
- All channels within Timer_A share the same timer block
- Timer_A has
- TACLK and INCLK are
- In continuous mode of the counter
- TACLR bit in TACTL
- TACCTLn is a
- CCI1B comes from
- Which of the following parameters are given by the TACCR0?
- Why Timer_B is not considered as most suitable one for receiving asynchronous signals?
- Their is double buffering in the immediate mode?
- Double buffering protects channel 0
- Timer_B has
- The capture/compare registers TBCCRn are double-buffered, when used for compare events?
- The length of TBR can be programmed to be
- TBOUTH can pin can be used to
- TBCLn provided in each channel is actually
- When TBR counts to zero
- Which of the following is the analog to digital converter that is present in the MSP430 based processors?
- Higher resolution along with the slow speed is given by which ADC module?
- The technical terms that helps us in differentiating between converters are:
- The number of repeated closeness to the true value is accounted by
- Resolution is
- The process of reduction of a continuous input to a discrete output is
- Which of the following functions can be used for converting the nearest integer to its argument?
- Integral nonlinearity is termed as
- The SNR_______ with the increase of the number of bits
- The intervals between the samples is obtained from
- Comparator_A+ is controlled by which of the following peripheral registers?
- CAON bit is used to
- P2CA4-P2CA0 bits are used for
- CAREFx bits are used for
- Which of the following bits are not actually associated with the comparator module
- Flag CAIFG is raised,
- Setting a bit in the Port Disable register CAPD causes the circuits for the usual digital input and output buffers to be disconnected from the appropriate pin
- Which bit is used for exchanging the two inputs of the comparator and invert its output to compensate?
- Changes in Vcc changes the value of V+ ?
- The relaxation oscillator circuit helps in
- The successive approximation converters have resolution of
- In SAR based conversions, each bit typically requires one clock cycle (sometimes two) to make a comparison and set up the new voltage
- The main operations that are basically performed in a SAR ADC are?
- Usually a capacitor is inserted between an analog input and the ground because
- ADC10 and ADC12 are
- ADC10 needs external capacitors on its voltage reference
- ADC10CTL0 and ADC10CTL1 are registers
- While conversion is in progress, which of the flag is affected
- ADC10SHTx bits allow_________cycles of the ADC10CLK
- The input to the ADC10 is selected from_______bits of the ADC10CTL1 register?
- The basic idea behind the sigma delta converter is that
- Sigma delta converter is a
- Sigma delta converter is having good resolution
- Here the word sigma represents
- SD16_A features are controlled by
- The second part of the ADC handles purely digital signals
- The second part of the ADC’s output is in the form of
- The filtered digital signal is then decimated to
- Decimated means
- The SD16 has a second-order modulator with a
- What actually is bit bagging?
- SPI, I2C, Asynchronous serial communication are the means of communicating a processor with its associate partners?
- All digital communications doesn’t require any clock
- SPI needs______ wires than I2C?
- USI handles
- USCI consists of
- LIN is enabled in which of the following channels?
- Can one device have more than one USC interfaces?
- Which of the following conditions is more difficult to attain?
- Timer_A is used in
- Is SPI a full duplex technique?
- The concept of SPI is based on
- Writing on the trailing edge of the clock pulse and reading on the leading edge of the clock pulse is done when
- When CPOL=1 then,
- Is CPKH and CPOL the same
- SPI with the USI can be selected by
- SCLK, SDO, and SDI are found___________on F20x3
- Transmission and reception are made at a time in SPI?
- When the buffer is________ the low power mode is__________
- Falling edge of the SS pin denotes
- The I2C bus uses which of the following lines
- I2C is faster means of data transfer than SPI?
- Each slave has its unique address
- Pull-up resistors Rp keep the lines at VCC when
- Rising edge on SDA while SCL is high denotes
- Which of the following is an issue while programming I2C using software?
- Which of the following is the slave to be addressed when a device acts as a master
- Is baud rate selected in I2C?
- How is I2C with USI different from I2C with USI_B?
- UCB0RXIFG is set when
- Asynchronous serial communication usually requires two wires for each direction plus a common ground
- In asynchronous mode of transmission, usually the data is sent along with the
- The _____ rate gives the frequency at which the bits are transmitted on the line
- Baud rate is the reverse of the
- Clock is transmitted in the asynchronous communication?
- A framing error occurs is the bit is
- What is the non return to zero format?
- LSB is sent first in case of the non return to zero format
- Their are _______ clocks in the USCI_A
- BITCLK16 is the
Computer
PIC (Programmable Integrated Circuits)
(c).because it returns to the main program after clearing the roll over flag of the interrupt, so that the interrupt can be caused again
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