Patent ID: 6172942
Filing Date: 2001-01-09
Classification: G04C

Abstract:
an analog electronic watch comprising:an oscillation circuit;a frequency dividing circuit for dividing an output of said oscillation circuit;a system clock generating circuit for generating a system clock from an output of said oscillation circuit;a ROM in which procedures such as a clocking operation of a watch are programmed;a CPU for decoding data programmed in said ROM and for performing various arithmetic processes;a RAM for storing various data;an interrupt signal generating circuit for generating an interrupt signal to said CPU;a chopping pulse generating circuit which receives a timing signal from said frequency dividing circuit and causes a duty of a chopping pulse to be variable;a one-shot pulse generating circuit which receives an end signal of a motor driving pulse outputted from said chopping pulse generating circuit and a timing signal from said frequency dividing circuit, and outputs a one-shot pulse;a pulse rank storage circuit for storing pulse states of said chopping pulse generating circuit and said one-shot pulse generating circuit;a motor driver circuit which receives outputs of said chopping pulse generating circuit and said one-shot pulse generating circuit and drives a motor;a motor driven by said motor driver circuit; anda rotation detecting circuit for detecting rotation/non-rotation of said motor,characterized in that said chopping pulse generating circuit and said one-shot pulse generating circuit can independently control variation of the duty and generation of the one-shot pulse by said CPU in accordance with the data of said ROM.