MCPFE

Front

The NVIC manages prioritisation of interrupts, this becomes very important when multiple interrupts are in use. Identify the correct statement in the following:

Back

An interrupt which has occurred, and to which the CPU cannot yet respond, is called "pending".

Front

What are the three operation modes of a standard timer?

Back

Capture mode, Compare mode, PWM mode

Front

The resolution, range, and number of bits of an ADC are linked. An n-bit ADC has a resolution of 1 part in 2^n values. For example, an 8-bit ADC with a range of 10 volts can resolve measurements into 10/256 = 39mV. Identify the correct combination of values in the table below: No.nResolutionRange 1819.53 mV5.000 V 2104.88 mV10.000 V 3100.08 V5.120 V 4124.00 mV4.096 V Options: Row 2, Row 3, Row 1, Row 4

Back

Row 1

Front

A pulse width modulated signal is shown below. Identify the correct statement:

Back

The period is 5 ms, frequency is 200 Hz, on-time is 1 ms, duty cycle is 20%.

Front

A simple software timing function, based on a for loop, is shown here. If each iteration of the for loop takes 2.5 us to execute, estimate the overall duration of the function. void delay(void){ int j; //loop variable j for ( j = 0; j < 20480 ;j++) { j++; j-; //waste time } }

Back

51.2 ms

Front

A simple program for an Mbed-enabled microcontroller is shown below. #include "mbed.h" AnalogOut Aout(p18); Analogin Ain(p20) int main() { while(1) { Aout=Ain; } } Identify the correct statements:

Back

An analog output is created on pin 18, analog input on pin 20, the line Aout=Ain; triggers both an analog to digital and a digital to analog conversion, Aout and Ain are both of data type float.

Front

Which of the following are not components of a standard timer? Prescaler, Program counter, Compare register, Timer register

Back

Program counter

Front

Is this statement true or false: "In compare mode, an interrupt is generated every time the values of the compare register and the timer register are equal."

Back

True

Front

A certain simple formula relates input digital number (D), number of bits (n), reference voltage (Vr) and output voltage (Vo) for most DACs. For a number of different DACs, identify which combinations of values are correct:

Back

Row 3

Front

What is true about continuous data in the context of signal types?

Back

In continuous data, any value (possibly within a certain range) can be taken.