MC68HC908JL3ECDW

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The MC68HC908JL3ECDW is a variant of the 8-bit MC68HC08 microcontroller family, specifically designed for automotive applications. It was designed and manufactured by Motorola (now Freescale Semiconductor).

The MC68HC908JL3ECDW is a low-cost, low-power device that comes in a 28-pin QFP package. It includes an on-board 16 KB Flash program memory, 3 KB RAM, a 2-channel 10-bit ADC, support for a wide range of peripheral modes, and a range of timers and counters.

The device is suitable for use in a range of automotive applications; including vehicle control systems, engine control systems, communications, and safety monitoring.

Application Field

One of the major applications of the MC68HC908JL3ECDW is in engine management systems, where it is used to control the various functions in the engine, such as fuel injection, ignition timing, and emissions control. It is also commonly used in vehicle security systems, such as immobilizers, as well as controlling internal and external systems such as audio, display and HVAC (Heating, Ventilation, and Air Conditioning).

The MC68HC908JL3ECDW is also widely used in the medical industry. Its high level of accuracy and low power consumption make it well suited for use in medical device applications. It is commonly used in heart rate monitors, blood pressure monitors, glucose monitors, and insulin pumps.

It is also widely used in a range of consumer electronics applications, such as LCD controllers, remote controls, audio processing equipment, and gaming consoles.

Working Principle

The MC68HC908JL3ECDW is a single-chip microcontroller that uses a Harvard architecture to process instructions. The device is based on a Von Neumann architecture, with an 8-bit bus for data and an 8-bit bus for instructions. Both buses are clocked by an oscillator, which produces an 8-MHz signal. Instructions are stored in Flash memory and are fetched from memory and executed using instruction decode logic. Data can be stored in RAM or in special-function registers (SFRs). Data can be transferred between memory and SFRs using an instruction-based approach, or using interrupts.

The device supports a wide range of peripheral modules, including an ADC, system clock, I/O ports and SPI (Serial Peripheral Interface). The ADC has two 10-bit inputs, which are sampled at the rising edge of the system clock. Data can be read and written to the ADC using the on-board I2C peripheral.

The MC68HC908JL3ECDW also has a range of timers and counters that can be used to generate timed events or count transitions on external signals. In addition, there are a number of interrupt sources that can be used to detect events or to synchronize activities between peripherals.

Conclusion

The MC68HC908JL3ECDW is a low-cost, low-power microcontroller from Freescale Semiconductor that is specifically designed for automotive applications. It includes a 16-KB Flash program memory, 3-KB RAM, a 2-channel 10-bit ADC, support for a range of peripheral modules and a range of timers and counters. These features make the MC68HC908JL3ECDW suitable for use in a wide range of automotive and medical applications, as well as consumer electronics.

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