Name: ELE 356 Spring 2018 Test 2 Part A Multiple Choice: Select One Correct Answ

Question

Name: ELE 356 Spring 2018 Test 2 Part A Multiple Choice: Select One Correct Answer (50%) 1. Which needs to be set for an interrupt to be processed? a. Global interrupt enable bit b. Interrupt flag bit c. Local interrupt enable bit d. All of the above 2. Which points to an interrupt in memory? Interrupt number b. Interrupt vector c. Interrupt table d. None of the above 3. Which reset activates when the supply voltage drops below a certain threshold? a. External reset b. Brown-out reset c Power-on reset d. Watchdog timer reset 4. Which register sets an I/O port as input or output? a DDRX b. PORTX c PINX d. All of the above 5. Which is not true of memory-mapped L/0? a. It requires an extra control signal to prevent data bus conflicts b. It allows for a simple CPU design c. It does not require special instructions for LVO access d. It reduces the amount of memory available for application programs 6. Which is not a type of serial communication? a. SPI b. Ethernet c. RS-232 d. None of the above 7. Which is not an SPI pin? a. MOS b. SDA c. SCLK 8. Timers can do which of the following? a. Reset themselves b. Trigger an interrupt c. Cause a pin to change state d. All of the above 9. Per RS-232 standards, which voltage is a logical "1"? a. +15V b. +5V d. -15V 10. What factor needs to be considered when constructing an interrupt? a. The time required to execute higher priority interrupts b. The time required to complete the ISR c. The length of time that other interrupts will be disabled d. All of the above Page 1 of 2

Explanation / Answer

1.------------------ a   

2. ......................b

3. ......................b

4. ......................a

5. ......................b

6. ......................b

7. ......................b

8. .....................d

9. .....................d

10. ...................d

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