Explain index mode and base address mode, Electrical Engineering

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Explain index mode and base address mode (with examples) available in microprocessors.

Index Mode and Base Address Mode:

Address supplied through the instruction is added to an index register's contents.
Base address mode is same except, the index register is replaced through a base address register.

Illustration:

LDAC 5(X); here X = 10

Reads data by location (5 + 10) = 15 and stores this in the accumulator.

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