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3.7
Crystal Adjustment
The Connectivity Test application includes a utility to help adjust the onboard trim capacitance for the
MC1322x 24 MHz crystal reference oscillator. The trim capacitance can be changed to center the oscillator
frequency on the target 24 MHz, thus minimizing the error frequency (in ppm).
For more information on tuning the oscillator, see the MC1322x Reference
Manual.
The reference frequency cannot be monitored directly via a GPIO pin, so as a substitute, the application
provides 2 MHz frequency derived from the reference oscillator and makes it available on the TMR1
signal pin.
To use this utility the "ADJUST CLOCK SETTINGS" option must be selected from the terminal main
menu.
When the "ADJUST CLOCK SETTINGS" option is selected, the terminal displays the following menu.
_____________________
|
| Clock Settings Menu |
|_____________________|
1 - Set Bulk 4 pF CAP.
2 - Adjust COARSE TUNE
3 - Adjust FINE TUNE
p - Previous Menu
MC1322x SMAC Demonstration Application User's Guide, Rev. 1.3
Freescale Semiconductor
Figure 3-18. Range Test Stop and Start
NOTE
|
Connectivity Test
3-13
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