4 bit cpu instruction set

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special purpose 4-bit microprocessor using the skills learned from digital logic Keywords: Digital Design; Microprocessor; Instruction Set; ALU; Ultiboard; ENEE 446: Digital Computer Design — The RiSC-16 Instruction-Set Architecture. 1 They are illustrated in the figure below. opcode reg A reg B reg C. 0. 4 bits. Data address register (internal), 8 bits. Instruction register (internal), 4 bits. Flags, Carry, Zero, Data (external I/O). Instruction set, 16 variable length instructions 14 Apr 2011 Sad to relate, I haven't gotten around to completing Part 4 of my Heath Robinson Rube Goldberg (HRRG) Steampunk Computer mini-series Once I had my instruction set, microcode instruction set, and register design, I was able to proceed with designing what really is the heart of the processor: a A description of the overall design of the original CPUville TTL processor. I wanted an instruction set similar to those of the 8-bit microprocessors I was used to. However I added 4 bits to the accumulator to allow this (details in main and The following table contains the description and the command examples of the instruction set of APOLLO181 processor. Notes for the 4-bit immediate operands:. In computer architecture, 4-bit integers, memory addresses, or other data units are those that are 4 bits wide. Also, 4-bit CPU and ALU architectures are those that are based on registers, address buses, or data buses of that size. The data bus is 4 bits wide, as one should expect for a 4-bit CPU. The program bus is 8 bits wide: 4 bits for the instruction opcode, and 4 bits for the immediate operand or high bits of the target address. Because instruction opcodes are 4 bits wide, there are 16 possible types of instructions.