Microcontroller Practice Test 3

1. In ADC0808/0809 IC which pin is used to select Step Size?

Vin

None of the mentioned

Vref

Vref/2 & Vin

2. Find the control word for PA = out, PB = in, PCL = out, PCH = out (Mode0)?

0x82H

0x03H

0x02H

0x83H

3. A thermistor is a __________

adc

micro controller

sensor

transducer

4. In reading the columns of a matrix, if no key is pressed we should get all in binary notation

5. What are DPDT relays?

Single pole, single throw

Double pole, double throw

Single pole, double throw

None of the mentioned

6. While programming the ADC0808/0809 IC what steps are followed?

select the analog channel, activate the ALE signal (L to H pulse), start the conversion, monitor the conversion, read the digital results

select the analog channel, start the conversion, monitor the conversion, display the digital results

select the channel, start the conversion, end the conversion

select the analog channel, activate the ALE signal (H to L pulse), start the conversion, monitor the conversion, read the digital results

7. In DS12887, which out of the following is correct about the SQW pin?

all of the mentioned are correct

it can provide up to 15 different square waves

it is an output pin

the frequency of the square wave is set by the register A

8. If we need to operate a key of a keyboard in an interrupt mode, then it will generate what kind of interrupt?

T0/T1

RESET

EX0/EX1

9. DS12887 has _____ amount of RAM for general purpose applications.

114 bytes

128 bytes

14 bytes

9 bytes

10. Which of the following statements are true about DAC0808?

parallel digital data to analog data conversion

none of the mentioned

it has current as an output

all of the mentioned