Abstract: A counter timer device includes a plurality of registers each capable of performing any of the function of a counter/timer register, the function of a capture register and the function of a compare register, in accordance with a command from a central processing unit, and a plurality of task registers corresponding to tasks which are to be carried out by using the above registers. Each of the task registers stores a task instruction for specifying a counter/timer register and a capture/compare register which are used in a task, and for specifying the operation mode of each of the specified registers. The task registers are scanned to successively read out the task instructions, and each of the read-out task instructions controls the operation of each of registers used in a corresponding task. Thus, tasks corresponding to the task instructions are all carried out at once.

Abstract: A counter/timer device includes a plurality of registers each capable of performing the function of any of a counter/timer register, a capture register and a compare register, in accordance with a command from a central processing unit, and a plurality of task registers corresponding to tasks which are to be carried out by using the above registers. Each of the task registers stores a task instruction for specifying a counter/timer register and a capture/compare register which are used in a task, and for specifying the operation mode of each of the specified registers. The task registers are scanned to successively read out the task instructions, and each of the read-out task instructions controls the operation of each of registers used in a corresponding task. Thus, tasks corresponding to the task instructions are all carried out at once.

Abstract: Disclosed is a position detecting method and apparatus which are suitable for detecting the position of a moving body on the basis of the output of a position detector for generating two-phase periodic waves having a phase difference of a quarter period, the method comprising the steps of: comparing either one of the two-phase periodic waves with a predetermined reference value having hysteresis to thereby obtain a roughly estimated position for every half period of the one periodic wave; analog-to-digital converting the two-phase periodic waves and a zero-cross value for every sampling period to thereby obtain a finely estimated position; and detecting the position of the moving body on the basis of the roughly estimated position and the finely estimated position while correcting an error due to the hysteresis at the starting point of the roughly estimated position, by use of the relationship between the roughly estimated position and the finely estimated position.

Abstract: A computer and an input/output device are connected via an interface bus. The input/output device has registers. The computer and the input/output device operate upon the basis of a pair of clock signals. When the input/output device accesses the registers via read and write buses, the buses are precharged during a first period of first clock signal of the pair and controlled by data during a first period of second clock signal of the pair. When the computer accesses the registers via the interface bus, the bus is precharged during the first period of the second clock signal of the pair and controlled by data during the first period of the first clock signal of the pair.

Abstract: A position/speed detection method and apparatus employing an encoder mounted on the rotary shaft of a motor in order to control the position and speed, wherein the coarse position and fine position are simultaneously detected by an encoder pulse and an encoder original signal, respectively and the detected results are combined to detect the position and speed of the motor with high precision.