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Find schematics/other technical documents for the XL STAR accelerometer demo board here.

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XL_STAR - Develop, Download and Debug for less...

The XL_STAR board allows a user to develop, download and debug up to 64KBytes of 'C' or assembler object code for the MC9S08MM128 MCU using CodeWarrior for MCUs V6.3 Special Edition, a professional IDE, for just the cost of the board. Connected to the MM128 MCU, via I2C, is the MMA8451Q a three axes accelerometer. The board is pre-programmed with firmware that uses the MM128 MCU and MMA8451Q accelerometer to drive a star array of LEDs.

 

The firmware demonstrates the various modes that the accelerometer can be operated in and the results are displayed via the LED array. The complete source code is available to users of the board. Supplied with the board are an installation CD and a USB cable, allowing users to connect the XL_STAR to a Windows PC for immediate development.

XL_STAR - Designed for both hardware and software engineers

The XL_STAR is designed to allow both hardware and software engineers to work in parallel during project development. Once the CodeWarrior development software is loaded the software engineer can initiate either a new project or use the example project provided as a starting point.

 

For the hardware engineer all the signals from the MM128 MCU are brought out to 0.1” pitch plated through holes down two sides of the PCB. With the addition of 2x 32-way SIL sockets the hardware engineer can place the XL_STAR into a prototyping ‘bread board’ to add external circuitry before committing to prototype PCBs.

 

Once the prototype PCBs are ready, by removing two resistors from XL_STAR the board can be used, via an OSBDM (Open Source Background Debug Mode) connection, to debug the developers target hardware with the addition of a 6-way ribbon cable.

Applications
  • Portable designs – the MM128 MCU and MMA8451Q accelerometer have very low power modes, measured using jumpers and an ammeter on the XL_STAR board
  • Applications requiring movement detection and interpretation – the MMA8451Q allows free fall, shake, tap, transient and orientation detection for embedded applications
  • Embedded designs requiring USB connectivity – the MM128 MCU also contains a USB OTG on-chip module, which integrates the USB transceiver. Together with a certified free of charge USB OTG stack from Freescale, the XL_STAR offers fast time to market for embedded USB applications

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Gordon  Padkin is a Product Marketer working in Freescale's Microcontroller  Solutions Group. Gordon has worked in the semiconductor industry for 14  years in a range of marketing roles supporting Freescale's embedded  microcontrollers and microprocessor families.

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Roy  Luo is familiar with embedded hardware design, MCU, DSP and FPGA/CPLD  design especially.  He is currently an technical marketing engineer with  GTC China.

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