In a logic integrated circuit such as an FPGA, a controller reads in an instruction,
and then directly transmits ON/OFF information for each of bits composing microcode
included in the instruction, to registers and data memories that are allocated
to each of the bits through control lines, to thereby control the registers and
data memories. Thus, processing executed by the controller is simplified in this
construction. This allows makings the controller having a simple structure, thereby
making it possible to construct a simple CPU core on the logic integrated circuit
such as the FPGA, decreasing a space of analytic logic, and eliminating necessity
for re-integrating a hardware circuit every time the logic is renewed.
