This set of Basic MSP430 Microcontroller Questions and Answers focuses on “Digital Inputs, Outputs and Delays”.
1. Which of the following registers are related to port P1?
a) P1SEL
b) P1DIR
c) P1IES
d) All of the mentioned
View Answer
Explanation: All of the mentioned registers are related to Port1.
P1SEL → Port Select Port pins are often multiplexed with other peripheral module functions. P1SEL and P1SEL2 bit is used to select the pin function – I/O port or peripheral module function.
P1DIR → Direction register selects the direction of the corresponding I/O pin.
P1IES → Interrupt Edge Select.
2. A pull-up or pull-down resistor ___________
a) removes the full output drive on the output pin
b) gives only a feeble current through the pull-up to resistor
c) removes the full output drive on the output pin & gives only a feeble current through the pull-up to resistor
d) none of the mentioned
View Answer
Explanation: A pull-up or pull-down resistor is used to remove the full output drive on the output pin. It also gives a feeble current through the pull-up to a resistor.
3. P1.3 is the ___________
a) input CCI1A to Timer_A
b) is connected to the voltage reference VREF of SD16_A
c) is output TA0 from Timer_A
d) are digital inputs with pull-up resistors
View Answer
Explanation: P1.3 is connected to the voltage reference VREF of SD16_A.
4. What actually is SD16_A?
a) it is an interrupt
b) it is a timer
c) it is an analog to Digital Converter
d) it is a serial communication module
View Answer
Explanation: SD16_A is an analog to the digital module.
5. P1IE and P1IES are registers that are used to ___________
a) control the Port1 digital i/o ports
b) control the Port1 interrupts
c) control the Port1 serial communication interfaces
d) all of the mentioned
View Answer
Explanation: P1IE and P1IES both registers are used to control the Port1 interrupts.
6. Unused pins must never be left unconnected in their default state as inputs.
a) true
b) false
c) cant be said
d) depends on the conditions
View Answer
Explanation: Unused pins must never be left unconnected in their default state as inputs. This follows a general rule that inputs to CMOS must never be left unconnected or “floating”.
7. Which of the following is an effect of a Schmidt trigger?
a) it turns slowly varying inputs, which might cause problems while they pass slowly through the undefined range of input voltages, into abrupt, clean logical transitions
b) It eliminates the effect of noise on the input, provided that it is not large enough to span the gap between the upward and downward thresholds
c) none of the mentioned
d) all of the mentioned
View Answer
Explanation: Schmidt trigger has two of the above mentioned effects in it.
8. To ensure that a negative fluctuation does not trigger an unwanted downward transition by pulling the input down through VIT−, we must choose
a) minimum hysteresis
b) maximum hysteresis
c) all of the mentioned
d) none of the mentioned
View Answer
Explanation: To ensure that a negative fluctuation does not trigger an unwanted downward transition by pulling the input down through VIT−, we must choose a minimum hysteresis of 0.3V.
9. The SPDT switch can be used as a ___________
a) detecting circuit
b) debouncing circuit
c) devaluing circuit
d) degenerating circuit
View Answer
Explanation: The SPDT(single pole, double pole) switch can be used as a debouncing circuit of a switch.
10. Debouncing can be carried out at a hardware as well as the software end?
a) yes
b) no
c) cant be said
d) depends on the conditions
View Answer
Explanation: Debouncing can be carried out at both the fronts both at the software as well as the hardware front, to carry out the process appropriately.
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