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Module 1: Fundamentals of Microprocessors

20232m

For 16-bit operations, register E can be paired with what register?
(i) A
(ii) B
(iii) C
(iv) D

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Answer: (iv) D

Explanation: In 8085 (and 8086-compatible 8-bit register pairing for 16-bit operations), the general-purpose registers are paired as:

  • B-C → B is high byte, C low byte
  • D-E → D is high byte, E low byte
  • H-L → H is high byte, L low byte

For 16-bit data operations (LXI, DAD, STAX/LDAX, LHLD/SHLD using H-L), E must be paired with D to form the 16-bit register pair D-E. Similarly in some textbooks "E can be paired with D" for 16-bit moves. Option (iv) D is correct.

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