Question

Explain why the number of output ports in the peripheral- mapped i/o is restricted to 256 ports

Answer 1

Answer:

The number of output ports in the peripheral I/O is restricted to 256 ports because

the operand of the OUT instruction is 8-bits; it can have only 256 combinations.

Explanation:

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Answer 2

The number of output ports in the peripheral- mapped i/o is restricted to 256 ports

• Because the operand of the OUT instruction is 8 bits and can only have 256 permutations, the number of output ports in the peripheral I/O is limited to 256 ports.
• If multi-byte instructions are permitted, a processor with an 8 bit wide ALU can execute more than 256 instructions. This is demonstrated by the 8085, Z80, 8086, 6809, and 68HC11, among other devices.
• An operand in a computer is the portion of an instruction that designates the data to be operated on or modified, and consequently, the data itself.
• The most possible values for an 8-bit system are 256, or 0 through 255. Table 5.1 lists the total number of states that can be expressed as well as the number of bits in a binary integer. G gigabits are equal to 1,0737,41,824 kilobits, 1024 kilobits, and 1,048,576 megabits.

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