Abstract: Some embodiments relate to a vehicle electronic controller having a microcomputer and a port expansion element, with reduced power consumption and radio noise. An MCU (microcomputer) performs determination processing that determines whether an output condition is established that is based on a signal that is input via a signal input port of the MCU. If the output condition is established, the MCU transmits a signal output instruction to a port expansion element via a communication port, and if not, the instruction is not transmitted. The port expansion element outputs a signal via a signal output port in response to an instruction from the MCU. The port expansion element automatically switches, depending on whether communication via the MCU is being suspended, between operation in a waiting mode in which the internal oscillation circuit is suspended, and operation in a normal mode in which the internal oscillation circuit is operated.

Abstract: Some embodiments protect aluminum electrolytic capacitors without increasing the thickness or height dimension of a unit case of an onboard electronic control unit, which is provided with the unit case and a circuit board on which the aluminum electrolytic capacitors are mounted. The circuit board includes a first surface and a second surface, and the unit case houses the circuit board. The unit case includes a first main wall facing the first surface, a second main wall facing the second surface, and perimeter walls. The capacitors are mounted on the second surface so as to extend along a specific periphery of the circuit board and be mutually connected in parallel. The unit case has a height dimension capable of housing the aluminum electrolytic capacitors without the aluminum electrolytic capacitors contacting the inside surface of the second main wall.

Abstract: Some embodiments relate to a vehicle electronic controller having a microcomputer and a port expansion element, with reduced power consumption and radio noise. An MCU (microcomputer) performs determination processing that determines whether an output condition is established that is based on a signal that is input via a signal input port of the MCU. If the output condition is established, the MCU transmits a signal output instruction to a port expansion element via a communication port, and if not, the instruction is not transmitted. The port expansion element outputs a signal via a signal output port in response to an instruction from the MCU. The port expansion element automatically switches, depending on whether communication via the MCU is being suspended, between operation in a waiting mode in which the internal oscillation circuit is suspended, and operation in a normal mode in which the internal oscillation circuit is operated.