Abstract: Provided is a method for controlling an advance angle of a power engine which can associate the rotational speed or be rotational period with the advance time period by using a single small look up table in a simple manner, and can be implemented by using a relatively small storage device. Because of provision of the steps of detecting a rotational period of a power engine as a binary number consisting of a first number of bits; extracting a second number of bits from the binary number, the second number being smaller than the first number; obtaining a rotational period parameter from the extracted bits or by convening the extracted bits by an arithmetic process based on the first number, the second number, and a minimum value of the rotational period of the engine; and determining an advance angle for each given rotational speed of the engine by looking up a table specifying a relationship between the rotational period parameter and the advance angle.

Abstract: An information processing apparatus with an instruction prefetch unit is disclosed, in which a CPU operation can be stopped at a desired address in response to a break signal. The instruction prefetch unit has an instruction prefetch circuit storing an instruction and an indication register storing the break signal. A read operation and a write operation of the indication register are executed together with those of the instruction prefetch circuit. Thus, a break point can be set a desired address by using the indication register, and the break operation can be correctly preformed without the need for complex hardware.

Abstract: Solid phase reaction products are employed as reflecting planes of a semiconductor laser facing each other with an active layer in between, which significantly improve its performance and productivity.