A semiconductor integrated device has one signal processing IC and one microcomputer
unit (MCU). A few terminals of the IC are connected to the corresponding terminals
of the MCU. The terminals of the IC that are connected to the corresponding terminals
of the MCU are disposed near each other. Similarly, the terminals of the MCU that
are connected to the corresponding terminals of the IC are disposed near each other.
Moreover, the IC and the MCU are mounted, on a substrate, so that the connected
terminals of the IC and MCU face each other.