8255A Ports I/O Modes Quiz

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What is the purpose of the handshaking signals in MODE 1 of the 8255A?

To transfer data between ports with the same data transfer rate

To synchronize the data transfer between the 8255A and the external device (correct)

To set or reset individual bits in port C

To allow for bidirectional data transfer on a single data bus

Which mode of the 8255A allows for bidirectional data transfer on a single 8-bit data bus?

BSR (Bit Set/Reset) Mode

MODE 0

MODE 2 (correct)

MODE 1

In the I/O (Input/Output) MODE 0 of the 8255A, how are the input and output ports configured?

Port A and Port B are configurable as input or output, while Port C is fixed as input

All ports are fixed as either input or output

All ports are configurable as either input or output (correct)

Port A and Port B are fixed as input, while Port C is configurable as input or output

What is the purpose of the Bit Set/Reset (BSR) mode of the 8255A control word?

To set or reset individual bits in port C Signup and view all the answers

In MODE 1 of the 8255A, which ports can be used for input or output with handshaking signals?

Port A and Port B Signup and view all the answers

Which mode of the 8255A allows for the most flexible input/output configuration?

MODE 0 Signup and view all the answers

In the handshake mode for Port A of the 8155, which signals from Port C are used as control signals?

PC0, PC1, PC2 Signup and view all the answers

What is the purpose of the STB (Strobe) signal in the handshake mode?

It is an input signal from the peripheral to the 8155 to indicate data is ready Signup and view all the answers

In the status word format of the 8155, which bit position represents the Timer flag?

D6 Signup and view all the answers

What is the purpose of the INTE (Interrupt Enable) bit in the status word format?

It enables or disables the interrupt capability of the 8155 for both Ports A and B Signup and view all the answers

In the given example of interfacing design using the 8155, which signal from Port C is used for the Start of Conversion (SOC) signal?

PC5 Signup and view all the answers

What is the purpose of the decoder in the given example of interfacing design using the 8155?

To assign I/O port addresses for the 8155 Signup and view all the answers

In Mode 1 of the 8255A PPI, which control signals are used for Port A when configured as an input port?

PC3, PC4, PC5 Signup and view all the answers

What is the function of the IBF (Input Buffer Full) signal in Mode 1?

Indicates that the input buffer has received data and is full Signup and view all the answers

In the control word format for Mode 2, what do the D4 and D3 bits represent?

Don't care bits Signup and view all the answers

8255A Ports I/O Modes Quiz

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Questions and Answers

What is the purpose of the handshaking signals in MODE 1 of the 8255A?

Which mode of the 8255A allows for bidirectional data transfer on a single 8-bit data bus?

In the I/O (Input/Output) MODE 0 of the 8255A, how are the input and output ports configured?

What is the purpose of the Bit Set/Reset (BSR) mode of the 8255A control word?

In MODE 1 of the 8255A, which ports can be used for input or output with handshaking signals?

Which mode of the 8255A allows for the most flexible input/output configuration?

In the handshake mode for Port A of the 8155, which signals from Port C are used as control signals?

What is the purpose of the STB (Strobe) signal in the handshake mode?

In the status word format of the 8155, which bit position represents the Timer flag?

What is the purpose of the INTE (Interrupt Enable) bit in the status word format?

In the given example of interfacing design using the 8155, which signal from Port C is used for the Start of Conversion (SOC) signal?

What is the purpose of the decoder in the given example of interfacing design using the 8155?

In Mode 1 of the 8255A PPI, which control signals are used for Port A when configured as an input port?

What is the function of the IBF (Input Buffer Full) signal in Mode 1?

In the control word format for Mode 2, what do the D4 and D3 bits represent?

Which lines of Port C are used as handshake signals for Port B when configured in Mode 1, regardless of whether Port B is an input or output port?

What is the purpose of the INTE (Interrupt Enable) signal in Mode 1?

In the status word format for Mode 2, what does the OBF A bit represent?

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