Embedded Systems Flashcards

1
Q

Real-time system

A

respond to some external stimuli within a stated/minimum time. For example, an alarm will sound immediately (or a light will switch on) when a PIR sensor detects movement.

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2
Q

Embedded Systems

A

a combination of hardware and software designed to
perform a specific function. They are called ‘embedded’ because they are often used as part of a larger system. Many embedded systems use sensors to receive analogue or digital inputs

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3
Q

Advantages of Embedded Systems (ES)

A

-Generally cheaper
-fast (typically run on a dedicated micro-controller)
-more reliable since they’re less complex
-automated (requires minimal user intervention once started)
-portability(generally smaller size)

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4
Q

Examples of Embedded Systems

A

Can be part of devices and larger systems
-Camera
-GPS
-Washing Machine
-Microphone
-ATM
-Drone
-Central heating
-fire alarm
-mp3 players
-microbit
-Voice control devices (Alexa)

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5
Q

What differentiates embedded systems from general systems

A
  1. Designed for specific tasks. Unlike computer systems they cannot be programmed to do anything beyond what they were designed for.
  2. Minimal user interface and easy to use
  3. little to no human intervention required
  4. Use microprocessors or microcontrollers to design and use limited memory
  5. Typically don’t require much power
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6
Q

Disadvantages of Embedded Systems

A
  1. Limited power and memory restricts functionality
  2. Can’t adapt to new tasks or requirements
  3. Vulnerable to security attacks due to specialized hardware
  4. ES connected to a network can be vulnerable to attack if network is attacked. e.g. malware and batabreaches
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