MC9S08QD2MSC

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Recently, more and more embedded applications are being developed, requiring high-performance and low-power microcontrollers. The MC9S08QD2MSC from Freescale semiconductor is designed to meet such requirements. The purpose of this article is to discuss the application field and working principle of this microcontroller.

Overview of MC9S08QD2MSC microcontroller

The MC9S08QD2MSC microcontroller is a version of S08 CPU core and is designed for low-powered embedded applications. It has a powerful 8-bit S08 core with an impressive range of on-chip peripherals and memory. It operates at a maximum frequency of 24 MHz and has on-chip flash memory up to 16KB and RAM up to 1 KB in an 8-pin package.

The MC9S08QD2MSC supports various analog and digital peripherals, namely 3-channel 12-bit Analog-to-digital Converter (ADC), ATD Conversion module (ATDCx), up to 4-channel pulse width modulation (PWM), an Inter-Integrated Circuit Bus (I2C), a Universal Synchronous Asynchronous Receiver Transmitter (USART) and 8-bit timers (TMRA and TMRB).

The device also features four programmable low-power modes. These are Halt, Stop, Wait and Very-Low-Power Run modes that make the device suitable for battery-powered applications. It is available in two variations, namely Low Pin Count Package (LPC) of 8-pins and Maximum Peripheral count (MPC) of 64-pins.

MC9S08QD2MSC application field and working principle

The MC9S08QD2MSC microcontroller is used in embedded applications that require high performance yet low power consumption. Applications include motor control, power management, automotive and industrial control, portable medical devices, robotic applications, and power tools. It can also be used in gaming systems, real-time clocks, dataloggers, sensor applications, digital power supplies, LED lighting, and RFID.

The MC9S08QD2MSC device uses an 8-bit Harvard architecture with von Neumann memory structure. This architecture is tailored towards low-power embedded applications, due to its low instruction cycle time and efficient memory access. The device contains flash memory for code storage, RAM for data storage, peripheral registers for peripheral control, addresses and data registers for memory access, and an accumulator for arithmetic and logic operations.

The working of this microcontroller can be divided into four essential steps — fetching, decoding, execution, and storing. During the fetching stage, the instruction is read from the memory and loaded into the instruction register. In the decoding stage, the instruction is decoded by the instruction decoder and then the execution stage is initiated. During the execution stage, the instruction is executed, and the results are stored in the accumulators. Finally, the results obtained are stored to memory.

Conclusion

The MC9S08QD2MSC microcontroller is a promising device for low-power embedded applications. It has impressive on-chip peripherals and offers a range of low-power modes. With its 8-bit Harvard architecture and von Neumann memory structure, it delivers an efficient, low-latency solution for embedded applications. It offers a wide range of applications such as motor control, automotive and industrial control, portable medical devices, and sensor applications.

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