Interrupt I/O is a data transfer method in which an external device informs the microprocessor that it is ready for communication and requests attention. The 8085 interrupt process is controlled by the Interrupt Enable flip-flop. The microprocessor is said to be interrupted when the flipflop is enabled and the signal INTR goes high. The instruction …
A subroutine is a set of instructions that will be used repeatedly in different locations of the program. Instead of repeating the same instructions several times, they can be combined into a subroutine that is called from various locations. A subroutine in Assembly language can exist anywhere in the code. However, It is a common …
The stack in an 8085 can be described as a reserved area of the memory in the R/W memory where we can store temporary information. It is a shared resource as it can be shared by the microprocessor and the programmer. Programmers use the stack to store data and the microprocessors use the stack to …
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 …
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 …
