io mapped io and memory mapped io in 8085

I/O Mapped I/O and Memory Mapped I/O in 8085 Assembly Language

In 8085 Assembly Language, I/O Mapped I/O and Memory Mapped I/O are two different methods used to interface with input/output (I/O) devices.

I/O Mapped I/O: In I/O Mapped I/O, a separate address space is dedicated to I/O devices. This means that specific memory addresses are assigned to different I/O devices. The processor communicates with these devices by reading from or writing to these specific memory addresses.

For example, let's say we have a keyboard connected to the 8085 processor using I/O Mapped I/O. The keyboard may be assigned a specific address, such as 0xFF00. To read input from the keyboard, the processor would read the value at address 0xFF00. Similarly, to send output to the keyboard, the processor would write a value to address 0xFF00.

To access I/O devices using I/O Mapped I/O, specific instructions are used, such as IN and OUT instructions.

Memory Mapped I/O: In Memory Mapped I/O, I/O devices are mapped to the same address space as the memory. This means that memory addresses can also be used to access the I/O devices. The processor communicates with the devices by reading from or writing to these memory addresses.

For example, let's say we have a display connected to the 8085 processor using Memory Mapped I/O. The display may be mapped to a specific memory address, such as 0x1000. To send data to the display, the processor would write the data to address 0x1000, just like writing to any other memory location. To read data from the display, the processor would read the value at address 0x1000.

To access I/O devices using Memory Mapped I/O, the same instructions used for accessing memory are used. This means that memory read and write instructions, such as MOV, can be used to access the I/O devices.

In both I/O Mapped I/O and Memory Mapped I/O, the processor uses specific instructions to perform the input/output operations. The choice between the two methods depends on the specific requirements of the system and the devices being used.

I hope this explanation helps you understand the concepts of I/O Mapped I/O and Memory Mapped I/O in 8085 Assembly Language. If you have any further questions, feel free to ask.