In 8085 microprocessor with memory-mapped I/O which of the following is true?

Microprocessors normally use two methods to connect external devices:

• Memory-mapped I/O
• Port/Peripheral Mapped I/O

Memory-Mapped I/O:

• 16-bit device address
• Data transfer between any general-purpose register and I/O port
• The memory map (64K) is shared between the I/O device and system memory
• More hardware is required to decode 16-bit address
• Arithmetic or logic operation can be directly performed with I/O data

Memory-mapped I/O is mapped into the same address space as program memory and/or user memory and is accessed in the same way. Port mapped I/O uses a separate, dedicated address space and is accessed via a dedicated set of microprocessor instructions.

Peripheral Mapped I/O:

• 8-bit device address
• Data is transferred only between the accumulator and I.O port
• The I/O map is independent of the memory map; 256 input device and 256; The output device can be connected
• Less hardware is required to decode 8-bit address
• Arithmetic or logical operation cannot be directly performed with I/O data