Consider the following registers : (a) A and B registers (b) B and C registers (c) D and E registers (d) H and L registers Which of these 8-bit registers of 8085 microprocessor can be paired together to make a 16 bit register ?
(b), (c) and (d)
The 8085 microprocessor consists of several 8-bit registers which can be paired together to form 16-bit register pairs. Understanding the concept of register pairing is crucial for efficient use of the CPU resources in programming and operation.
Here is a breakdown of which registers can be paired:
- Register Pairing: The 8085 microprocessor allows certain register pairs to combine into 16-bit registers, enabling operations on words (16-bit data). The possible pairs are:
- B and C: These two registers can form the BC register pair.
- D and E: These can form the DE register pair.
- H and L: These can form the HL register pair, which is often used for indirect addressing memory.
Given these pairings, let us evaluate the options provided:
- (a) A and B registers: These cannot be paired together as they do not have a defined register-pairing mechanism in the 8085 microprocessor.
- (b) B and C registers: These can be paired together to form a 16-bit register (BC).
- (c) D and E registers: These can also be paired to form a 16-bit register (DE).
- (d) H and L registers: These can be paired to form a 16-bit register (HL), often used in memory addressing.
From the evaluations above, we can conclude that the correct answer is option (b), (c) and (d), as these registers (BC, DE, HL) can logically pair into 16-bit registers in the 8085 microprocessor.
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