To easily attain function setting, and to simplify a user operation by inputting a program via a port for communication and an interface, and wiring data included in the program in an RAM at the wiring of the program in a flash memory.

At the outputting of a writing instruction and transferring a program, a CPU 15 of a one-chip microcomputer 12 starts the RAM transfer program of a flash memory 13 in advance, starts a writing/erasing control program, and writes a program transmitted from a computer in a flash memory 13. In an electronic counter which writes the program, at the time of start, the CPU 15 performs access to the program in the flash memory 13 and realizes a timer function. In sequential operations, when a data output instruction which is an external device side operational condition is present in the program, data are read from an RAM 14 and outputted via an interface 11 and a communication port 10 to the external device side.