UFC719AE101 3BHB003041R0101 Controller module

Instruction register: A register that holds the instructions currently executed or to be executed. An instruction contains an opcode that determines the type of operation and an address that indicates the source or destination of the operand. Instruction length varies from computer to computer, so does instruction register length. All operations of the computer are performed by analyzing the instructions stored in the instruction registers. The input side of the instruction register receives instructions from the memory, and the output side of the instruction register is divided into two parts. The operation code part is sent to the decoding circuit for analysis to indicate what type of operation the instruction should perform; The address part is sent to the address adder to generate a valid address, and then sent to the memory, as the fetch or store address