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What is the range of values an 8-bit register can store?

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What is the range of values an 8-bit register can store?

(a) 128

(b) 64

(c) 256

(d) 32

I have been asked this question in an interview for internship.

My question is taken from 8 Bit Accumulator Processor of Embedded System topic in division Embedded Processors of Embedded Systems

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Correct option is (c) 256

The explanation is: 2^8 = 256. So, an 8-bit register can store 256 values (from 0 to 255).

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