This Freescale tower board is based on the KL25Z128VLK4 which is a 48MHz device from the ultra-low-power KL family with Cortex-M0+ core and USB. This KL25 device has 128k Flash and 16k SRAM and is in an 80 pin LQFP package, whereby the KL25 is also available in various other LQFP packages (32, 48, 64 pins) and its memory ranges from 32k ..256k Flash and 4k ..32k SRAM. There is an 8MHz crystal on the board for clocking the part.

Full details and documentation for this board can be obtained from the Freescale web site: TWR-KL25Z48M

To configure the µTasker project for this board simply enable the define TWR_KL25Z48M in the project's config.h file. The compiler needs to be set to build for Cortex M0+ (and not Cortex M4) and the linker script KL_128_16.ld should be selected [KL_128_16_BM.ld for downloadable version] {the linker script extension may vary for different compilers, whereby *.ld is valid for GCC}

TWR-KL25Z48M Binaries

Here are some binary files that can be loaded to the board. These were built using the µTasker applications (serial loader and V1.4 application) and can be simply generated using the supported compilers/IDEs [these were built using GCC], built using different configuration options or modified to suit specific requirements or hardware derived from this board :

  • uTaskerSerialBoot_TWR-KL25Z48M_KBOOT_HID_UART_MSD.bin KBOOT compatible USB-HID loader with composite USB-MSD loading, as well as KBOOT UART loading on UART 0 at 57'600 Baud [16.0k] allowing applications to be loaded at link address 0x8080 (using Freescale's KBOOT USB connection, or KBOOT UART at 57'600 Baud or USB-MSD when the board appears as upload hard disk). When operating, the green LED blinks at 5Hz. To force the loader reset the board with push button SW4 held down. To disable the watchdog reset the board with push button SW3 held down. This can be loaded using the TWR-KL25Z48M's USB-MSD (OpenSDA) boot loader. Note that the loader limits application sizes to 40k - it can be built without limits using the µTasker project.
  • uTaskerV1.4.8_BM_TWR-KL25Z48M_8080.bin TWR-KL25Z48M application with command-line menu on the virtual COM connection (115'200 Baud) with various menu items (as well as on UART0), including the ability to switch to USB-UART-0 bridge mode with end-to-end flow control. Output from the on-board accelerometer can be viewed in the I2C menu. Low power modes can be set in the application menu. The USB device is a composite USB-CDC, HID mouse and HID-keyboard device. The keyboard operation can be tested by pressing the push button SW4 which behaves as the 't' key. The mouse operation can be tested by using the push button SW3 which behaves as the left-click of a mouse. Drivers that can be used for this device are available below. The processor runs at 48MHz [35.2k].
    Linked to 0x8080, this binary image can be loaded with drag-and-drop onto the upload disk that appears when the serial loader is operating or using the KBOOT loader's USB or UART connections. When the application is running the green LED blinks at 2.5Hz.
  • uTaskerV1.4.8_TWR-KL25Z48M.bin The same TWR-KL25Z48M application as stand-alone software that can be loaded using the TWR-KL25Z48M's USB-MSD (OpenSDA) boot loader [36.2k].

  • uTaskerFreescale_mouse_kb_VirtualCOM.inf USB composite mouse/keyboard/CDC installation file for 32-bit windows.
  • uTaskerFreescale_mouse_kb_VirtualCOM_64bit.inf USB composite mouse/keyboard/CDC installation file for 64-bit windows. See the following for a guide to installing unsigned drivers on Windows 8.1

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µTasker Kinetis TWR-KL25Z48M support. Copyright (c) 2004..2018 M.J.Butcher Consulting