Tips and Suggestions
Following are a number of tips, suggestions and answers to common questions that will solve many problems users have with the CMD912X development system. You can download the latest software from the Support section of our web page at:
www.axman.com
Utilities
∙If you’re trying to program memory or start the utilities, make sure all jumpers and CONFIG SWITCH settings are correct.
∙Be certain that the data cable you’re using is
∙Make sure the correct power is supplied to the board. You should only use a 9 volt, 300 mA adapter or power supply. If you’re using a power strip, make sure it is turned on.
∙Make sure you load your code to an address space that actually exists. See the Memory Map if you’re not sure. The CONFIG switch changes the memory map.
∙If debugging under Mon12, make sure you're not
∙If you’re running in a
Code Execution
∙Make sure the CONFIG SWITCH is set for the proper mode.
∙CONFIG switch 3 must be ON to access the external bus (LCD display, etc) even if executing code from Internal Flash memory.
∙Under Mon12, breakpoints may not be acknowledged if you use the CALL command. You should use one of the GO command instead.
∙Check the HC12 reset vector located at FFFE - FFFF. These 2 bytes contain the address where execution will begin when the unit is powered on.
∙When running your code
∙You must either reset the COP watchdog timer in the main loop of your code or disable it when not running under Mon12 or BDM mode. The micro enables this by default and if you don't handle it your code will reset every couple of ms.
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