25 Questions
Which type of device is PPI 8255?
Programmable I/O device
How many 8-bit bidirectional I/O ports does PPI 8255 consist of?
Three
What is the function of Port C in PPI 8255?
It is further divided into two 4-bit ports and can work in BSR mode or in mode 0 of input-output mode
How many control groups does PPI 8255 have?
Two (control group A and control group B)
Which value is used to select different ports in different modes as input-output functions or BSR in PPI 8255?
CS’, A1, A0
What is the mode of operation of Port A in PPI 8255?
Mode 0, mode 1, or mode 2 of input-output mode
In which mode does the PPI 8255 work if the MSB of the control word (D7) is 0?
Bit set reset (BSR) mode
Which pin is used as the Reset input in PPI 8255?
RESET
What is the function of the A1 and A0 pins in PPI 8255?
Address input
Which mode of operation does PPI 8255 work in if the MSB of the control word (D7) is 1?
Input-Output mode
Which statement best describes the Handshake I/O mode of PPI 8255?
Port A or Port B can work as simple input port or simple output port, and port C bits are used for handshake signals before actual data transmission.
What is the main advantage of the PPI 8255 in terms of versatility?
It operates in a variety of modes, making it a versatile component in many different systems.
What is a disadvantage of the PPI 8255 in terms of functionality?
It is not capable of high-speed data transfer.
What does the PPI 8255 lack compared to newer I/O interface components?
High-speed data transfer capability
What makes the PPI 8255 an affordable option for many applications?
Its relatively low-cost
What type of signals are represented by physical variables and change smoothly over time?
Analog signals
Which devices commonly generate analog signals corresponding to the intensity of light in a scene?
CCD and CMOS image sensors
What type of signals can only take a finite set of values?
Digital signals
Which type of sensors commonly measure temperature and produce an analog voltage proportional to the measured temperature?
Thermocouples and resistance temperature detectors (RTDs)
What is the main advantage of digital signals over analog signals?
They are less susceptible to noise and signal degradation
What is the role of DACs in embedded systems?
Converting digital signals into analog signals for actuators and analog instruments
What is the function of ADCs in the context of analog and digital signals?
Sampling the input signal at a specified rate and quantizing the sample value into a finite set of discrete values
In what way do digital signals contribute to efficiency in processing?
They can be processed and manipulated more efficiently using digital logic circuits
What characterizes embedded systems in smart homes?
They generate and process both analog and digital signals to control lighting, heating, and security systems
What makes digital signals more resilient compared to analog signals?
Their discrete nature makes them less susceptible to noise, crosstalk, and signal degradation
Test your knowledge about the PPI 8255, a versatile programmable I/O device used to interface microprocessors with external components such as ADC, DAC, and keyboards. This quiz covers its features, programming, and applications.
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