8051 Pin Description - MCQs with Answers

8051 Pin Description - MCQs with Answers

Q1. Where should the pin 19 (XTAL1), acting as an input of inverting amplifier as well as part of an oscillator circuit, be connected under the application of external clock?

a. to XTAL2
b. to Vcc
c. to GND
d. to ALE

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Q2. Which port does not represent quasi-bidirectional nature of I/O ports in accordance to the pin configuration of 8051 microcontroller?

a. Port 0 (Pins 32-39)
b. Port 1 (Pins 1-8)
c. Port 2 (Pins 21-28)
d. Port 3 (Pins 10-17)

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Q3. Which among the below mentioned functions does not belong to the category of alternate functions usually performed by Port 3 (Pins 10-17) ?

a. External Interrupts
b. Internal Interrupts
c. Serial Ports
d. Read / Write Control signals

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