5.1 State TWO applications of microcontrollers in commercial devices. 5.2 Refer to FIGURE 5.2 below and answer the questions that follow. 5.2.1 Identify A and B. 5.2.2 Describe the function of the CPU. 5.2.3 Describe the function of the input/output unit (I/O). 5.3 List THREE advantages of microcontrollers over traditional discrete electronic components. 5.4 With reference to the registers of a CPU: 5.4.1 Describe the CPU register. 5.4.2 List THREE special purpose registers. 5.5 Refer to FIGURE 5.5 below and answer the questions that follow. 5.5.1 Explain the function of the A/D converter. 5.5.2 Explain why an A/D converter is used with microcontrollers. 5.6 Refer to FIGURE 5.6 below and answer the questions that follow. 5.6.1 Label A. 5.6.2 Explain the function of the control bus. 5.6.3 Explain the function of the address bus. 5.7 With reference to serial peripheral interfaces (SPI): 5.7.1 State the characteristics of the serial peripheral interface (SPI). 5.7.2 State the function of the serial peripheral interface (SPI). 5.7.3 State TWO applications of the serial peripheral interface (SPI). 5.8 Answer the following questions with reference to the RS-485 communication protocol. 5.8.1 State the typical operating voltages for logic '1' and logic '0'. 5.8.2 List THREE devices that can be used with the RS-485 interface. 5.9 Refer to FIGURE 5.9 below and answer the questions that follow. 5.9.1 Label A, B and C. 5.9.2 Describe how data is transferred through the device. 5.10 Design a flow chart for a monostable device which has only ONE stable state. It changes state when it is triggered by an input, and stays in that state for 5 seconds. It then returns to its original state.

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5.1 State TWO applications of microcontrollers in commercial devices - NSC Electrical Technology Digital - Question 5 - 2020 - Paper 1

Question 5

5.1 State TWO applications of microcontrollers in commercial devices. 5.2 Refer to FIGURE 5.2 below and answer the questions that follow. 5.2.1 Identify A and B. ... show full transcript

Worked Solution & Example Answer:5.1 State TWO applications of microcontrollers in commercial devices - NSC Electrical Technology Digital - Question 5 - 2020 - Paper 1

Step 1

State TWO applications of microcontrollers in commercial devices.

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Lighting in advertising and illumination of spaces.
Stock control.

Step 2

Identify A and B.

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A = ROM B = RAM

Step 3

Describe the function of the CPU.

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The CPU is responsible for interpreting and executing the stored instructions from the ROM program.

Step 4

Describe the function of the input/output unit (I/O).

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The Input/Output unit enables the microcontroller to communicate with the outside world via peripherals.

Step 5

List THREE advantages of microcontrollers over traditional discrete electronic components.

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Products based on microcontrollers can be smaller and cheaper.
They can have fewer components and are more reliable.
Products using microcontrollers can be more flexible as their features are programmed into the chip.

Step 6

Describe the CPU register.

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A CPU register (processor register) is a small set of data holding places that are part of the computer processor.

Step 7

List THREE special purpose registers.

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Program Counter (PC)
Memory Address Register (MAR)
Current Instruction Register (CIR)

Step 8

Explain the function of the A/D converter.

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The A/D converter is used in microcontrollers to detect an analogue signal and convert it into a digital format that the CPU can interpret.

Step 9

Explain why an A/D converter is used with microcontrollers.

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A/D converters are essential in microcontrollers to convert analogue signals from sensors into digital signals that can be processed.

Step 10

Label A.

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A = Data bus

Step 11

Explain the function of the control bus.

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The control bus is used mainly for the CPU to issue control instructions to both memory and input/output ports.

Step 12

Explain the function of the address bus.

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The address bus transmits the memory addresses from the memory and input/output ports to the CPU.

Step 13

State the characteristics of the serial peripheral interface (SPI).

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SPI is a synchronous serial communication data link that operates in full duplex and uses separate clock and data lines.

Step 14

State the function of the serial peripheral interface (SPI).

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The function of SPI is to send data between microcontrollers and small peripherals.

Step 15

State TWO applications of the serial peripheral interface (SPI).

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Digital signal processors
Shift registers

Step 16

State the typical operating voltages for logic '1' and logic '0'.

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Logic '1' = +200mV or more Logic '0' = -200mV or less

Step 17

List THREE devices that can be used with the RS-485 interface.

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Point of sale terminals
Metering instruments
PLCs

Step 18

Label A, B and C.

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A = Sender/Transmitter B = Direction of data flow C = Receiver

Step 19

Describe how data is transferred through the device.

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Data is sent as one long stream of bits, counted and reconstructed into bytes, with a common clock pulse to synchronize the sender and receiver.

Step 20

Design a flow chart for a monostable device which has only ONE stable state.

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Start
Switch pressed?
- Yes: Output On
- No: Stay in the state
Wait for 5 seconds
Output Off
Return to Start

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