Provided is a light receiving circuit for detecting a change in amount of light, in which an input circuit at a subsequent stage is compact and inexpensive and current consumption is low. The monolithic body has a first portion accommodating integrated electronic components, and a second portion, accommodating the coupling and the microactuator. Plural characteristic shift voltages having discrete values are applied to some of the devices, electron emission characteristics of each of these devices are measured, and a characteristic adjustment table is generated for each characteristics shift voltage value according to change rates of these measured characteristics. The first signal port is connected to the processing logic unit, to which at least one fourth signal port for connecting an inputoutput bus terminal subscriber belongs, and a respective second signal port is connected to a third signal port.