Abstract: An optical system affixed to an electronic apparatus is provided, including a first optical module, a second optical module, and a third optical module. The first optical module is configured to adjust the moving direction of a first light from a first moving direction to a second moving direction, wherein the first moving direction is not parallel to the second moving direction. The second optical module is configured to receive the first light moving in the second moving direction. The first light reaches the third optical module via the first optical module and the second optical module in sequence. The third optical module includes a first photoelectric converter configured to transform the first light into a first image signal.

Abstract: An IEEE Std. 1149.1 boundary scan circuit which is capable of performing built-in self-testing includes a logic circuit, cascaded input boundary-scan cells that form an input boundary-scan register connected to input nodes of the logic circuit, cascaded output boundary-scan cells that form an output boundary-scan register connected to output nodes of the logic circuit, and a test access port system for controlling operation of the input and output boundary-scan cells. The test access port system provides a built-in self-test control signal to the input and output boundary-scan cells when executing built-in self-testing. The input boundary-scan register is reconfigurable to operate as a test pattern generator that provides test patterns to the logic circuit for a predetermined number of clock cycles upon receipt of the built-in self-test control signal.