This set of Embedded Systems Questions and Answers for Campus interviews focuses on “Timer-2”.
1. Which mode of the Intel timer 8253 provides a software watchdog timer?
a) rate generator
b) hardware triggered strobe
c) square wave rate generator
d) software triggered strobe
Explanation: The software triggered strobe can be used as a software-based watchdog timer in which the output is connected to a non maskable interrupt.
2. Which of the following mode is similar to the mode 4 of the 8253 timer?
a) mode 5
b) mode 6
c) mode 0
d) mode 1
Explanation: The mode 5 or the hardware triggered strobe is similar to the mode 4 or the square wave rate generator expect that the retriggering is done by the external gate pin.
3. Which pin of 8253 is used for the generation of an external interrupt signal?
a) OUT pin
b) IN pin
c) Interrupt pin
d) Ready pin
Explanation: The Intel 8253 timer has no interrupt pins. Therefore, the timer OUT pin is used to generate an external interrupt signal.
4. Which timer architecture can provide a higher resolution than Intel 8253?
a) Intel 8253
b) Intel 8254
c) 8051 timer
Explanation: The Intel 8253 and 8254 have same pin configuration and functions. 8051 timer is a programmable timer in the 8051 microcontroller. The MC68230 timer developed by Motorola can provide a powerful timer architecture which can provide higher resolution than the Intel 8253.
5. How many bit architecture does MC68230 have?
Explanation: The MC68230 timer have a 24-bit architecture which is splits into three 8-bit components because of the 8-bit bus in the MC68000 CPU.
6. How many bit bus does MC68230 have?
Explanation: The MC68230 timer have a 24-bit architecture which is splits into three 8-bit components because of the 8-bit bus which is used for the communication with the host processor like MC68000 CPU which have an 8-bit architecture.
7. Which of the following is a timer processor?
a) Intel 8253
d) Intel 8259
Explanation: Intel 8253 and 8259 are timers or counters which supports the processors. MC146818 is a real-time clock. MC68332 which is developed by Motorola is a 32 bit timer processor which can support MC68020.
8. What is the running frequency of MC68332?
a) 12 MHz
b) 14 MHz
c) 16 MHz
d) 18 MHz
Explanation: The running frequency of the MC68332 is 16 MHz.
9. Which of the following is a real time clock?
Explanation: The 8253, 8254 and 8259 are timers or counters developed by Intel whereas MC146818 is a real-time clock.
Sanfoundry Global Education & Learning Series – Embedded System.
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