Part I. (2 points each, choose the best answer) . For a DAC with 12-bit resolution and the reference voltage is 5 V, what value s be sent in order for the DAC to generate a 3V output? (a) 4572 (b) 4457 (c) 3457 (d)2457 hould (a) SCK (b) MOSI (c) MISO (d) Ss PORTC pins 6,5,4,1,0 into INT1 group? (a) ox73 (b) 0x37 (c) oxBc (d) oxc8 2. Which of the following signals is an output from the slave device in the sPt )3. 4. If the timer clock input frequency is 1.8 MHz, what would be the timer count What value should be written into the PORTC INTIMASK re gister if we want to put quired to create a delay of 16 ms? (a) 288000 (b) 28800 (c) 2880 (d) 288 In the dual-slope PWM mode, which register sets the frequency of aveform? (a) CCA (b) CTRLA (c) CTRLB (d) PER )6. What is the timer count required to create a time delay of 27 ms if the frequency of the timer clock input is 2 MHz? (a) 5400 (b) 54000 (c) 540 (d) 540000 7. Using the FRQ mode to play music assuming that the timer clock frequency has been scaled to 4MHz, what should be value to be loaded into the CCA register in order to play a note with 660 Hz? (a) 2303 (b) 1230 ()2480 (d) 3030 )8. How to send out a byte using the SPl interface? (a) read from the SPlx_DATA register (b) write data into the SPlxDATA register (c) write into the SPlx_CTRL register (d) write data into the SPlxI NTCTRL register )9. The first operation to perform to receive data from an SPI interface is (a) read from the DIR register (b) read from DATA register (c) read from the INTCTRL register (d) write into the Data register 10. Assume that TCFo clock frequency has been set to 4 MHz and you want to use the single-slope PWM to generate a 200 Hz waveform with 40% duty cycle from the PFO pin what value should be written into the TCFo_PER register? (a) 19,999 (b) 39.999 ()29.999 (d) 9,999 )11. Continue from problem 10, what value should be written into the TCFo_CCA registe n order to set the duty cycle to 40%"(a) 19,999 (b) 7,999 (c) 17,999 (d) 3.999 12. There many interrupt priority levels does the XMEGA have? (a) 3 (b)2 (c)1(d) 4 conversion (c) Perform data communication (d) measure temperature reading router (a) PER (b) CNT (c) CCA (d) CCB 13. What is the main function of the TC72? (a) Perform DIA conversion (b) Perform A 14. Which of the following equipment is a DTE? (a) modem (b) computer (c) printer( )15. In the XMEGA timer function, which register sets the frequency of the FRQ outp