What is the address range for 4 K RAM used in8085 microprocessor ifs used as the chip select logic?a)7000Hto 7FFFHb)6000Hto 6FFFHc)Either (a) or (b)d)None of theseCorrect answer is option 'C'. Can you explain this answer? - EduRev Electronics and Communication Engineering (ECE) Question

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What is the address range for 4 K RAM used in 8085 microprocessor if

's used as the chip select logic?

a)
7000_Hto 7FFF_H
b)
6000_Hto 6FFF_H
c)
Either (a) or (b)
d)
None of these

Correct answer is option 'C'. Can you explain this answer?

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What is the address range for 4 K RAM used in8085 microprocessor if...

For 4 K RAM (4 x 1024 = 2¹²), the number of address lines required will be 12. Hence, out of the 16 address'lines, 12 addresses lines (i.e. A₁₁., to A₀) will be used for addressing the memory location in a chip and the remaining four (i.e. A₁₅ to A₁₂) will be used for selecting the chip. Thus, the chip select signal is CS =

. So, the address lines A₁₅ = 0, A₁₄ = 1 and A₁₃ = 1. The line A₁₂ may be 0 or 1 and hence we will get separate range corresponding to A₁₂ = 1 and A₁₂ = 0

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