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Mode 2 Bidirectional Data Transfer of 8255 Video Lecture - Computer Science Engineering (CSE)
FAQs on Mode 2 Bidirectional Data Transfer of 8255 Video Lecture - Computer Science Engineering (CSE)
| 1. What is mode 2 bidirectional data transfer of 8255? |  |
Ans. Mode 2 bidirectional data transfer of 8255 is a mode of operation in which the 8255 programmable peripheral interface chip allows bidirectional data transfer between the microprocessor and the external devices connected to it. In this mode, the data lines (Port A) can be used to both input and output data.
| 2. How does mode 2 bidirectional data transfer work in 8255? | |
Ans. In mode 2 bidirectional data transfer, the control register of 8255 is configured to set Port A as bidirectional. When the microprocessor wants to send data to an external device, it writes the data to Port A. On the other hand, when the microprocessor wants to read data from an external device, it reads the data from Port A. The direction of data transfer is controlled by the control register.
| 3. What are the advantages of using mode 2 bidirectional data transfer in 8255? | |
Ans. Mode 2 bidirectional data transfer in 8255 offers several advantages. Firstly, it allows for efficient communication between the microprocessor and the external devices by enabling both data input and output on the same set of data lines. Secondly, it simplifies the overall design of the system by reducing the number of required data lines. Additionally, it provides flexibility in data transfer as the direction can be easily controlled through the control register.
| 4. Can mode 2 bidirectional data transfer be used for simultaneous input and output in 8255? | |
Ans. No, mode 2 bidirectional data transfer in 8255 does not support simultaneous input and output on Port A. The data lines (Port A) can be either used for input or output at a given time, controlled by the control register. It is not possible to perform input and output operations simultaneously on the same set of data lines in this mode.
| 5. How can the mode of operation be changed to mode 2 bidirectional data transfer in 8255? | |
Ans. The mode of operation of 8255 can be changed to mode 2 bidirectional data transfer by configuring the control register appropriately. The control register consists of several control bits that determine the mode of operation. To enable mode 2 bidirectional data transfer, the control bits associated with Port A need to be set accordingly to indicate bidirectional data transfer.
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Nov 07, 2024 Last updated |
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