Option setting device and method of operating same for use with

Details Option setting device and method of operating same for use with Option setting device and method of operating same for use with

1997-03-04

1998-05-05

Metjahic, Safet

Photography

Initializing/storing responsive to power switch

396301, G03B 726

Patent

active

057490040

ABSTRACT:
An option setting device for use with a camera includes a power supply unit supplying power to the option setting device, a microcomputer controlling the operations of the camera. A RAM stores option settings set by the microcomputer, while a non-volatile memory unit also stores the option settings set by the microcomputer. A normal reset generation unit generates a normal reset signal to reset the microcomputer after the introduction of power by the power supply unit, and an emergency reset generation unit generates an emergency reset signal to reset the microcomputer after an interruption of power from the power supply unit. A reset type discrimination unit determines after a reset has occurred whether the reset was caused by the normal reset generation unit or by the emergency reset generation unit and in the case that the reset type discrimination unit determines that the reset was caused by normal reset generation unit the contents of the non-volatile memory unit are transmitted to the RAM, and in the case that the reset type discrimination unit determines that the reset was by the emergency reset generation unit the microcomputer preserves the contents of the RAM without transmitting the contents of the non-volatile memory unit to the RAM. A method of operating the option setting device is also described.

REFERENCES:
patent: 4733265 (1988-03-01), Haraguchi et al.
patent: 5049917 (1991-09-01), Yasukawa et al.
patent: 5079585 (1992-01-01), Yamada
patent: 5081483 (1992-01-01), Ishimura et al.
patent: 5136327 (1992-08-01), Ogawa
patent: 5150147 (1992-09-01), Kobayshi et al.
patent: 5315345 (1994-05-01), Kawasaki et al.
patent: 5500710 (1996-03-01), Saito et al.

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