XT2 Oscillator Frequency

The XT2 frequencies of 4MHz, 8MHz, 12MHz, 16MHz and 24MHz are detected automatically by the USB stack.

Frequencies other than the once listed above need to be manually set (see Programmer’s guide, Programmers_Guide_MSP430_USB_API.pdf for detailed steps)

The API enables the XT2 oscillator when USB is active, and optionally disables it during USB suspend. It uses XT2 as a reference to the USB PLL.

XT2 needs one of these applied to it:

Many input frequencies are possible, allowing cost reduction: