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ECNG2006 : Introduction to Micro-Processors (Semester II- 2025/2026)

ECNG2006 : Introduction to Micro-Processors (Semester II- 2025/2026)

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Which ONE of the following features (if any) is NOT found in a communication peripheral:

Determination & addition of protocol-specific overhead information to the data (e.g. parity)

All of the above features may be found in communication peripherals

Buffering of TX and RX data

Notification of TX and RX events and errors

Automatic retransmission on error

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You wish to assign an assembly language variable to a space in the memory map of a PIC16F using the EQU directive. Which of the following is a suitable address?

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A micro-controller IC is configured so that a pin-voltage of +5V is interpreted as logic-high and -5V is interpreted as logic-low.

The signal

Q is associated with pin-5.

Which of the following statements are known to be CORRECT:

A pin voltage 2V will be interpreted as logic-high

When pin-5 is logic-low, the signal Q is asserted

When the voltage on pin-5 is 0V, the signal Q is asserted

Q is an Active High signal

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Which ONE of the following is NOT a feature of the PIC16F877?

4 bit multiplier

indirect addressing

built-in timers

2 stage pipeline

Harvard architecture

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A PIC16F877 powered at 4.9V is required to switch a digital signal line. The load at the end of the line sinks 40mA, and has a load capacitance of 0.1 pF. The load reads a logic high at V=2.5V and a logic low at 1.8V. Required rise/fall times for the signal are comparable to the nominal values for the PIC16F877 I/O pins. Which one of the following statements is NOT correct?

A pull-up resistor may be used to maintain the high bus voltage at appropriate levels.

The PIC16F877 pin will not be able to supply the load current

The rise and fall times for the signal voltage will be greater than those cited in the data sheet, because the load capacitance is too great.

The signal voltage will be less than the nominal values, and therefore may not meet the load requirements

The interface can be implemented if we use a buffer, or switch a transistor in order to drive the load

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You have built a circuit to connect an LED between a PIC16F877 port pin and ground (via a resistor). You have written a program which toggles the port pin which the LED is connected to. When you run the program on the PIC16F877, the LED does not appear to flash. Which ONE of the following statements is NOT a plausible explanation?

The port pin cannot sink sufficient current to light the LED

The port pin was configured as in input

The port pin is faulty

The port pin has open-drain output circuitry, and cannot exert a "true" high value

The LED is faulty or is connected backwards

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A student interfaces an LED (Voltage drop 1.8V Max. Current 5mA) to the PIC16F877. Which of the following is NOT an appropriate method of doing so:

tied to 5V through a 1 kilo-Ohm resistor

tied to 5V through a 100 Ohm resistor

tied to ground through a 1kilo-Ohm resistor

tied to 3V through a 220-Ohm resistor

tied to ground through a 2 kilo-Ohm resistor

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