The electronic control unit (ECU) is the brain of a modern car, controlling everything from the fuel injection to the ignition timing, and even the transmission. The ECU uses a microprocessor, which is essentially a tiny computer, to make decisions and send signals to the various components of the engine. But what CPU does a car ECU run on?

There is no one-size-fits-all answer to this question, as different car manufacturers may choose different microprocessors for their ECUs. However, there are a few types of CPUs that are commonly used in automotive applications.

One popular choice is the Motorola 68HC11 microprocessor. This is a 8-bit CPU with a clock speed of up to 8 MHz, and it has been used in a wide variety of cars over the years. The 68HC11 is known for its low power consumption and reliability, which makes it a good choice for the harsh automotive environment.

Another common CPU in automotive applications is the Renesas SH-2. This is a 32-bit CPU with clock speeds ranging from 66 MHz to 200 MHz. It is used in many high-performance cars and sports cars, as well as in some racing applications. The SH-2 is known for its fast processing speed and high level of programmability.

A third CPU that is sometimes used in car ECUs is the Texas Instruments TMS320F280xx. This is a 32-bit CPU that is specifically designed for motor control applications, making it a good match for the ECU. It has a clock speed of up to 90 MHz, and is known for its high level of integration and low power consumption.

There are also many other CPUs that may be used in car ECUs, depending on the specific requirements of the manufacturer and the application. Some other examples include the Infineon TriCore, the Freescale MC9S12XDP512, and the NXP LPC23xx.

Overall, the CPU used in a car ECU will depend on a wide variety of factors, including the desired level of performance, the cost of the component, and the specific requirements of the application. However, regardless of the CPU used, the ECU is a vital component of any modern car, and plays a critical role in ensuring that the engine runs smoothly and efficiently.