How does 8086 differentiated between an opcode and instruction data?
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How does 8086 differentiated between an opcode and instruction data?
By default, there is no distinction between code and data. Any given byte in memory can be treated as either or both. So, the short answer: If the instruction fetch unit fetched it, then the processor is going to try to interpret the result of that fetch as an instruction, once the IP reaches that address.
How does a computer know whether an address contains an instruction or data?
The processor assumes that whatever memory address its program counter points to at the start of an instruction cycle holds an instruction, and it will load that value into its instruction register and will try to execute it as if it were an instruction.
What are microprocessor instructions?
Data Transfer Group
| Instruction Set | Explanation | Example |
|---|---|---|
| LDA addr [A] ←[addr] | Load Accumulator direct | LDA 2400 H |
| STA Addr [addr] ←[A] | Store accumulator direct | STA 2000H |
| LHLD addr [L] ←[addr], [H] ← [addr + 1 ] | Load H-L pair direct | LHLD 2500H |
| SHLD addr [addr] ←[L], [addr +1] ← [H] | Store H-L pair direct | SHLD 2500 H |
What are the data and instructions together known as *?
Computer input is called data and the output obtained after processing it, based on user’s instructions is called information.
What is Tstate?
One time period of frequency of microprocessor is called t-state. A t-state is measured from the falling edge of one clock pulse to the falling edge of the next clock pulse. Fetch cycle takes four t-states and execution cycle takes three t-states.
What do you mean by an instruction explain the classification of instructions with the help of examples in 8085 microprocessor?
into
The 8085 instruction set is classified into 3 categories by considering the length of the instructions. In 8085, the length is measured in terms of “byte” rather then “word” because 8085 microprocessor has 8-bit data bus. Three types of instruction are: 1-byte instruction, 2-byte instruction, and 3-byte instruction.