I/o reference instruction

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in and out instructions in 8085

i/o port address decoding

io instructions in computer architecture

i/o instructions definition

input output instructions in microprocessor

i/o interfaceport address in microprocessor

memory mapped io

bit which indicate an input-output instruction. • In register-reference and I/O formats, only one of the lower 12 bits is set. Basic Computer Instruction Formats. 0. 11.Address connections above A15 are undefined for I/O instructions. In the Memory-mapped scheme, any instruction that references memory can be used.
Any instruction that references memory may be used to access an I/O port located in the memory space. For example, the MOV instruction can transfer data between any register and a port; and the AND, OR, and TEST instructions may be used to manipulate bits in the internal registers of a device (see Figure 8-1).
Expect to see new types of I/O devices, and new application of old types. I/O Devices . + may use all memory reference instructions for I/O. – cannot cache
No separate I/O instructions are needed in a CPU that uses memory-mapped I/O. Instead, we can perform I/O operations using any instruction that can reference
These instructions have as one operand the address of a port in the I/O address space. There are two classes of I/O instruction: Those that transfer a single item (byte, word, or doubleword) located in a register. Those that transfer strings of items (strings of bytes, words, or doublewords) located in memory.

25 Feb 2018 Memory-mapped I/O means a peripheral device is addressed just the to as instruction based I/O. It uses special input and output instructions, like the if an instruction is a memory reference or register reference instruction?
The IR(14-12) is 111 (differentiates it from memory reference) and IR(15) is 1 (differentiates it from register reference instructions). The rest 12 bits specify I/O
An instruction code is a group of bits that tells the computer to perform a specific operation part.
The outs instruction transfers a string from the memory byte or word pointed to by the ES:source index to the port addressed in the DX register. Load the desired port number into the DX register and the desired source address into the SI or ESI index register before executing the outs instruction.

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