Although the microcontroller in the vehicle ECU is used in the vehicle, its basic structure is the same as that of a common microcontroller.
In order to cope with the laws and regulations in recent years, ROM (ReadOnlyMemory, read-only memory) has been gradually changed to a flash memory type, and the contents stored in the ROM in units of modules can be changed.
The timing controller is a control device related to time and time. When the set time is consistent with the internal timing (timer value), it has a matching function to change the predetermined output, and a capture function to memorize the edge input time of the external signal. The matching function is used to determine the timing of the fuel injection signal output, etc. The capture function cooperates with the interrupt controller to detect the engine speed signal output and so on.
The communication interface is a device that communicates with the input/output expansion IC inside the ECU and other ECUs. In recent years, in order to cope with the LAN (LocalAreaNetwork, local area network) in the car, microcontrollers with built-in CAN functions have gradually increased.