MC9S12XDG128CAA

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MC9S12XDG128CAA Application Field and Working Principle

The MC9S12XDG128CAA is a high performance version of the 8-bit MC9S12X derivative of Freescale Semiconductor’s HC12 family of microcontrollers. It belongs to the embedded − microcontrollers which are designed specifically to offer embedded systems designers an economical but powerful solution. The MC9S12XDG128CAA is capable of running powerful applications yet with energy efficiency that is ideal for “always-on” applications.

Overview of MC9S12XDG128CAA

The MC9S12XDG128CAA belongs to the MC9S12X family of microcontrollers which offer enhanced performance, lower power consumption, an enhanced periphery set and enhanced code re-configurability. The MC9S12XDG128CAA shares the same CPU core as the other family members, which is a powerful 8-bit, 16-bit addressable enhanced HCS12 core with full featured arithmetic logic unit (ALU), multiple registers and access protection facilities.

Fields of Application

The MC9S12XDG128CAA has many potential applications, as its resources and flexibility enable it to handle a wide range of tasks. These include automotive, medical, industrial automation and consumer applications:

• Automotive applications - it is ideal for automotive safety systems such as anti-lock brakes, powertrain controllers and vehicle sensing systems.

• Medical applications - it is ideal for controlling equipment in medical devices such as infusion pumps and blood pressure monitors.

• Industrial automation applications - it is ideal for process control applications such as material handling or robotic systems.

• Consumer applications - it is ideal for consumer products such as remote control systems, cameras and entertainment systems.

Features and Benefits

The MC9S12XDG128CAA has several features that make it attractive for applications such as those outlined above. These include:

• A wide range of peripherals – the MC9S12XDG128CAA features an extensive set of on-chip peripherals. These include up to 11 timers, 3-channel serial interface (SCI), 10-channel analog to digital converter (ADC), 8-channel direct memory access controller (DMA), and 3-channel pulse width modulation (PWM) controller.

• Flexible memory – the MC9S12XDG128CAA has a selectable and expandable memory configuration, with up to 4 KB of RAM and 128 and 256 KB of program memory respectively.

• Low power consumption – the MC9S12XDG128CAA has an industry leading power management architecture, and has on-chip low power modules to reduce overall power consumption.

• Excellent performance – the MC9S12XDG128CAA is a high performance and cost effective microcontroller. It operates up to 25 MIPS and has the capability to switch processor modes between high speed and low power.

Working Principle

The MC9S12XDG128CAA operates on the principle of direct memory access (DMA). This system allows the microcontroller to access the different parts of its memory directly, without the need for software intervention. In this way, the CPU can be used for other tasks while data is being moved from one area of memory to another, or from memory to peripheral components.

The DMA system is programmed by software and consists of a main control register, a series of registers for the source and destination, and command registers. When the program sets up the registers, the DMA controller reads the source and destination, commands the peripheral and then transfers data between the two, as instructed by the program.

The micro controller’s memory map can be divided into up to eight sections and each section can be assigned to the DMA controller. This allows the controller to access up to four modules in parallel, using direct memory addressing (DMA). With this type of organization, the processing of instructions is much more efficient and powerful.

Conclusion

The MC9S12XDG128CAA offers embedded systems designers a powerful, economic solution for a wide range of applications. Its features, such as its extensive set of on-chip peripherals, its flexible memory configuration and its low power consumption make it an ideal choice for automotive, medical, industrial automation and consumer applications. Its operating principle is based on the direct memory access (DMA) system, which allows for the efficient processing of instructions and data.

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