18 Questions
What is the purpose of the handshaking signals in MODE 1 of the 8255A?
To synchronize the data transfer between the 8255A and the external device
Which mode of the 8255A allows for bidirectional data transfer on a single 8-bit data bus?
MODE 2
In the I/O (Input/Output) MODE 0 of the 8255A, how are the input and output ports configured?
All ports are configurable as either 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
In MODE 1 of the 8255A, which ports can be used for input or output with handshaking signals?
Port A and Port B
Which mode of the 8255A allows for the most flexible input/output configuration?
MODE 0
In the handshake mode for Port A of the 8155, which signals from Port C are used as control signals?
PC0, PC1, PC2
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
In the status word format of the 8155, which bit position represents the Timer flag?
D6
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
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
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
In Mode 1 of the 8255A PPI, which control signals are used for Port A when configured as an input port?
PC3, PC4, PC5
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
In the control word format for Mode 2, what do the D4 and D3 bits represent?
Don't care bits
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?
PC0, PC1, PC2
What is the purpose of the INTE (Interrupt Enable) signal in Mode 1?
Enables interrupts for the input buffer
In the status word format for Mode 2, what does the OBF A bit represent?
Output Buffer Full for Port A
Test your knowledge on the different I/O modes of 8255A ports, including MODE 0 for simple input/output, MODE 1 for input/output with hand shake, and MODE 2 for bi-directional data transfer. Learn about the programmable I/O capabilities of the 8255A ports.
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