1) The Nu-LB-NUC140 development board has 5 clock options, provide the name, fre

Question

1) The Nu-LB-NUC140 development board has 5 clock options, provide the name, frequency and whether they are internal or external?

2) How many independent sets of timers are supported? List and describe the Timeroperation modes(4) available on the Nu-LB-NUC140 development board.

3) Which timer option/mode would work best for a periodic interrupt of ½ second?

4) How do you calculate a ½ second “time out period” for the flashing LED?

5) What drivers from the BSP are needed to support your code in #4 ?

Explanation / Answer

1) The Nu-LB-NUC140 development board has 5 clock options, provide the name, frequency and whether they are internal or external?

A)1.One external 32.768 kHz low speed crystal

   2.One external 4~24 MHz high speed crystal

   3.One programmable PLL FOUT (PLL source consists of external 4~24 MHz high speed crystal and internal      22.1184 MHz high speed oscillator)

   4.One internal 22.1184 MHz high speed oscillator

   5.One internal 10 kHz low speed oscillator

2Q.How many independent sets of timers are supported? List and describe the Timer operation modes(4) available on the Nu-LB-NUC140 development board.

ans.4 sets of 32-bit timers with 24-bit 24-bit up-timer and one 8-bit pre-scale counter.

       TIMER0

       TIMER1

       TIMER2

       TIMER3

The timer can perform functions such as frequency measurement, event counting, interval measurement, clock generation, delay timing etc.,

Timers Provides 4 operation modes                             1.one shot,

                         2.periodic,

                         3.toggle and

   4.continuous counting operation modes

3Q.Which timer option/mode would work best for a periodic interrupt of ½ second?

Ans: Timer 1 is best for a periodic interuppt of 1/2 second.

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