Problem Detail: As i know the MU0 processor instruction format is as follows: 
so the opcode is 4 bit, can anyone explain why it has only 8 instructions, if it could have 16 instructions, 2^4 = 16 ??
so the opcode is 4 bit, can anyone explain why it has only 8 instructions, if it could have 16 instructions, 2^4 = 16 ??
Asked By : rainman
Answered By : D.W.
The mu0 microprocessor was designed for teaching purposes. As such, it was deliberately designed to be extremely simple. Having a simple instruction set is a benefit for teaching: it enables you to focus on core concepts, without being distracted by unnecessary complexity. Thus, presumably the designers of the mu0 designed their instruction set to have as few as instructions as possible, given their teaching goals. In this case, it doesn’t need more than those 8 instructions; those are more than enough to illustrate the primary concepts.
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