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HLT opcode means.
Load data to accumulator
Store result in memory
Load accumulator with contents of register
End of program
End of program
The 'HLT' instruction stands for 'Halt'. It is a processor control instruction used to stop the execution of a program or to put the microprocessor into a 'Halt' state, effectively suspending CPU operations until an external interrupt or reset occurs.
The 'HLT' instruction stands for 'Halt'. It is a processor control instruction used to stop the execution of a program or to put the microprocessor into a 'Halt' state, effectively suspending CPU operations until an external interrupt or reset occurs.
PCnextтАЛ=PCcurrentтАЛ тАФ In a halt state, the program counter remains fixed until an interrupt signal occurs.
When the microprocessor fetches the HLT opcode (e.g., 76H in Intel 8085), it finishes the execution of the current instruction and then enters a low-power state. In this state, the program counter does not increment, and the CPU suspends instruction execution until a valid hardware interrupt (like INTR, RST, or RESET) triggers the processor to resume activity.
HLT is a non-executable control instruction used to terminate a process flow gracefully.
The CPU enters a suspended state, consuming minimal power compared to a 'busy-wait' loop.
Hardware interrupts, such as the RESET signal, are required to transition the CPU out of the HLT state.
Commonly used in 8085 architecture with opcode 76H.
Reduces power consumption by pausing the clock signals to internal CPU registers.
Provides a clean way to terminate programs before reaching the end of memory or accidental infinite loops.
Requires external hardware intervention (interrupts) to resume normal operation.
Can lead to system 'hanging' if interrupts are not properly configured or enabled.
Ending a program execution in embedded systems.
Power management in idle battery-operated devices.
Debugging or waiting for hardware event triggers.
HLT (76H) does not affect any flags in the Flag Register.
Option A (Load data) refers to MOV or MVI instructions.
Option B (Store result) refers to STA or MOV instructions.
Option C (Load accumulator) refers to LDA or MOV instructions.
D is correct тАФ HLT (Halt) is a control instruction that stops the CPU from executing further instructions until a hardware interrupt is received.
Always remember that HLT is a 'wait' state instruction, not a 'termination' instruction that shuts down the machine; only a RESET or interrupt can resume the clock cycles.