Looping in 8085 Looping is a programming technique that instructs the Microprocessor to repeat tasks. It is accomplished by changing the sequence of execution using jump instructions. Loops can be classified into two groups: Continous Loops. Conditional Loops. Continous Loops A continuous loops repeats a task continuously. It is setup by using unconditional jump instruction. A […]
Looping, Indexing and Delay Generation in 8085 Read More »
8085 program to store a 8 bit data in memory MVI A, 24H – store 24H in the accumulator. STA 1423H – copy the contents of accumulator to memory loaction 1423H. HLT – stop the execution. 8085 program to add two 8 bit data numbers LXI H, 1500H – store the address of first number
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The timing diagram is a graphical representation of the process in steps with respect to time. It represents the step by step working of each instruction and its execution. The execution time of instructions is represented in T-states. Machine Cycle– The time required to access the memory or input/output device is called the machine cycle.
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The way in which the operand of an instruction is specified is referred to as addressing modes. The addressing mode specifies how the address field of the instruction is to be interpreted before the operand is actually executed. The 8085 microprocessor has 5 types of addressing modes. Immediate Addressing Mode In immediate addressing mode, the
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These instructions affect the operation of the microprocessor. Halt and No operation are the two program control or machine control instructions. Opcode Description HLT Halt1-byte instruction.The processor stops executing and enters waiting state.The address bus and databus are placed in high impedance state. Register contents are not affected. NOP No Operation1-byte instruction.No operation is performed.Generally
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