INTRODUCTION TO MICROPEOCESSOR
MICROPROCESSOR BASICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Addresses only
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Addresses and control but not data
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Addresses and controland data
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control and data lines
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Detailed explanation-1: -Address buffers: These buffers are meant for unidirectional transfer of schematic addresses which are only used for sending out the Most Significant Byte of the given address. The Most Significant Byte of the address goes to the buffers from the address latch internally.
Detailed explanation-2: -Unidirectional buffer is used to only one direction of data transfer. Bidirectional buffer is used to two directions: datas in and out.
Detailed explanation-3: -The address bus is unidirectional because the microprocessor addresses a specific memory location of the system. No outside devices can write into the Microprocessor. A data bus is bidirectional because the Microprocessor can read data from memory or write data to the memory.
Detailed explanation-4: -The main function of the address buffer is to take the address presented by the customer, latch it and have enough gain to drive the large load presented by the Row and Column Decoders. It must also present a small load to the pin that connects to the customers addresses and meet stringent set up and hold requirements.
Detailed explanation-5: -Data bus is used to transfer data from one unit to another unit of the computer system. Microprocessor can read data from the memory or write data to the memory. So, the data bus is bidirectional.