Abstract: A mouse device includes a motion detector for detecting motion of the mouse relative to a work surface. An optical mouse button optically detects movement of a finger positioned on the optical mouse button. A controller generates button press information based on the optically detected movement. The button press information indicates whether the optical mouse button has been actuated.

Abstract: A semiconductor device and method for modifying the firmware of the device after fabrication utilizes a shadow memory to “shadow” some or all of the original firmware in the ROM. In an exemplary embodiment, the semiconductor device is an optical navigation sensor that generates tracking information using captured surface images and a navigation code, which is included in the firmware. The shadow memory may be programmed with a complete modified firmware, which replaces the original firmware, or modified portions of the original firmware, which replace the corresponding portions of the original firmware. The use of the shadow memory allows the original firmware of the semiconductor device to be updated after the fabrication of the device. In addition, the shadow memory allows other data such as product identification information and proprietary functionality codes to be incorporated into the semiconductor device after fabrication.