Write a short note on Programmable register

Programmable : Stored Program Computer. This computer can execute programs inside the memory. This enabled programming on the computer. ... Non-programmable : Not-Stored Program Computer. About electrical computer, this can be coded only by soldiering.

Explanation:

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A processor register (CPU register) is one of a small set of data holding places that are part of the computer processor.

A register may hold an instruction, a storage address, or any kind of data (such as a bit sequence or individual characters). Some instructions specify registers as part of the instruction. For example, an instruction may specify that the contents of two defined registers be added together and then placed in a specified register.

A register must be large enough to hold an instruction - for example, in a 64-bit computer, a register must be 64 bits in length. In some computer designs, there are smaller registers - for example, half-registers - for shorter instructions. Depending on the processor design and language rules, registers may be numbered or have arbitrary names. Here you go ;)