Configuring The Main Crystal Oscillator - Microsemi SmartFusion2 Manual

2 – Configuring the Main Crystal Oscillator
You must configure the source of the crystal oscillator as well as its frequency (as shown in
Figure 2-1 • Configuring the Main Crystal Oscillator
The source may be one of the following:
• Crystal - The source is an external Crystal. In this configuration the clock frequency must be
between 32 KHz and 20 MHz.
• Ceramic Resonator - The source is a ceramic resonator. In this configuration the clock frequency
must be between 0.5 MHz and 4 MHz.
• RC Network - The source is an external RC circuit connected to the main crystal oscillator
external pins. In this configuration the clock frequency must be between 32 KHz and 4 MHz.
In all cases, refer to the Microsemi
about how the external component (crystal, ceramic resonator and RC network) must be connected on
the board to the SmartFusion2 device.
SmartFusion2 Microcontroller Subsystem User's Guide
Figure 2-1).
for details
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