Microprocessor

摘要

The microprocessor system has a central processing unit which includes an independent address data path 106 and an independent arithmetic logic unit (ALU) data path 104. Each is capable of simultaneous operation during a clock cycle. The data paths have a shared input multiplexer 116 connected to receive information from an information bus 102. A shared bus register 120 is connected to receive the information from the input multiplexer. The ALU data path has a register file 166 incorporating at least one bi-directional shift register linked to another register in the register file, and a shifter 148 which forms a portion of the ALU data path and supplies data from the ALU to the bus register 120 which is split into two one-byte registers to allow fast execution of byte instructions. A control unit for the microprocessor system includes a programmable logic array (PLA). The configuration of the ALU data path allows execution of very fast floating point arithmetic operations. It also allows substantially faster division operations than prior art microprocessors. The microprocessor system is desirably implemented in T<2>L and I<2>L bipolar technology on a single integrated circuit chip.