JPS57125377A - Electronic watch - Google Patents

Abstract

PURPOSE:To obtain an electronic watch which operates stably with a low consumption of electric current at the initial stage even by using a high voltage cell, by prohibiting driving pulse control motion in case when the cell voltage exceeded a given voltage. CONSTITUTION:If initial voltage of a lithium cell, etc. 45 is high, detecting output of a cell voltage deteting circuit 44 is inverted to high level. When this high level output and the detecting output to be inverted by an inverter 46 are impressed to control selecting gates 25 and 26, outputs of selecting gates 23 and 24 of a driving pulse control circuit 21 are cut off to prohibit driving pulse control motion. And, a pulse prescribed duty from a high-voltage driving pulse generating circuit 17 is given to a step motor through a driving circuit 35. When voltage of the cell 45 became below a prescribed voltage, the probibition of driving pulse control motion is cancelled to allow the step motor to be driven through a normal driving pulse generating circuit 16 and a compensating pulse generating circuit 18, etc., whereby a stable operation is achieved at the initial stage even by using a high voltage cell, and therefore, an electronic watch of low consumption of electric current is obtained.