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In 8085 name/names of the 16 bit registers is/are______.
Stack pointer
Program counter
Both
None of these
Stack pointer
In the Intel 8085 microprocessor, both the Stack Pointer (SP) and the Program Counter (PC) are designated 16-bit registers. These registers are essential for managing the flow of execution and memory addressing during program operation.
In the Intel 8085 microprocessor, both the Stack Pointer (SP) and the Program Counter (PC) are designated 16-bit registers. These registers are essential for managing the flow of execution and memory addressing during program operation.
Range=2┬░16=65,536┬аlocations тАФ The addressable memory range provided by a 16-bit register.
The Program Counter holds the 16-bit address of the next instruction to be executed, incrementing automatically after each fetch. The Stack Pointer holds the 16-bit address of the top of the stack in RAM, which is used for temporary storage of return addresses during interrupts and subroutine calls (CALL/RET instructions).
The 8085 is an 8-bit microprocessor, but it uses 16-bit registers for memory management.
Program Counter (PC) sequences the execution flow.
Stack Pointer (SP) points to the top of the stack area in Memory.
All other general-purpose registers (A, B, C, D, E, H, L) are 8-bit, though they can be paired (e.g., HL) to hold 16-bit values.
Enables addressing up to 64 KB of memory.
Simplifies subroutine handling and interrupt processing.
None, they are architectural necessities for Von Neumann/Harvard hybrid architecture.
16-bit operations on an 8-bit ALU require multiple clock cycles.
Instruction fetching
Nested subroutine calls
Interrupt handling stack management
The 8085 Address Bus is also 16-bit wide, matching the capacity of the PC and SP registers.
Option A is correct but incomplete as Option B is also correct; therefore, Option C is the best answer.
C is correct тАФ Both the Stack Pointer and Program Counter are 16-bit registers used for memory addressing in the 8085 architecture.
Always remember that while the 8085 is an 8-bit processor (data path), it is a 16-bit address architecture, meaning it can access 2┬░16 memory locations.