To generate pulses faster than the access time of a ROM.

A binary counter 1 outputs output (a) to a decoding circuit 3 and outputs remaining output (b) to the ROM 2 as an address. In the ROM 2, information to be outputted as the pulses is written for a number specifiable by the output (a) of the binary counter 1 for the respective addresses A0 to An-1. The decoding circuit 3 decodes the output (a) of the binary counter 1 and outputs the result of the decoding as decoded signals (d). A selection circuit 4 selects one of the output (c) of the ROM 2 read by the output (b) of the binary counter 1 according to the decoded signals (d) from the decoding circuit 3 and outputs it as a pulse signal.