| 摘要 |
PURPOSE:To prevent the generation of an error in data written in a holding memory even if the reset is executed or a power source is disconnected in the course of writing the data in the holding memory. CONSTITUTION:In a holding memory 11, an information recording area 11b for writing and recovering the data is provided in addition to a holding data store area 11a, (1) holding data is stored once in the information recording area 11b, and thereafter, (2) write of the holding data concerned is executed to the store area 11a, (3) the holding data is written in the store area 11a, and thereafter, (4) the information recording area 11b is cleared. In such a state, when a power source is turned on or when reset is released, an information recording area contents discriminating part 12a of a microprocessor 12 refers to the information recording area 11b, and in the case the holding data of the information recording area is not cleared, the holding data of the information recording area 11b is cleared after a write processing of the holding data of the information recording area 11b is finished. |
