a motor driven camera has a detachable drive unit , and includes a motor drive circuit which is activated for driving a film wind - up and shutter charge motor on receipt of a signal representative of termination of an exposure . the camera also includes a selector capable of being set at a single frame photographing position as well as at a continuous photographing position , and a control mechanism for preventing generation of the signal with the selector set at the single frame photographing position . a signal generating device is associated with a film wind - up stop mechanism for generating the signal when the stop mechanism is disengaged from a film wind - up and shutter charge mechanism in response to termination of an exposure , disengagement of the stop mechanism being prevented or the signal generating device being deactivated by the control mechanism when the selector is set at its single frame photographing position . the control mechanism is disabled to permit the generation of the signal when a shutter release member is returned from its operative position to its non - operative position .