jazz 209 Posted May 27, 2013 Share Posted May 27, 2013 I made a simple calculator with XT2 as input and USBPLLDIVB as output, for configuring USB PLL. Some calculated values are in Table 38-2 "Register Settings to Generate 48 MHz Using Common Clock Input Frequencies" of slau208 "MSP430x5xx MSP430x6xx Family User's Guide". USB spec defines the tolerance as +/- 0.25% (2500 ppm) for full-speed bus. MSP430USBCalc.rar bluehash 1 Quote Link to post Share on other sites
keithq 6 Posted October 4, 2013 Share Posted October 4, 2013 Jazz, I think that was you that just posted this to the TI E2E? This is cool and useful -- thanks for making this. Quote Link to post Share on other sites
jazz 209 Posted October 5, 2013 Author Share Posted October 5, 2013 Here is full list of XT2 values that are inside +/- 0.25% tolerance. xt2.rar bluehash 1 Quote Link to post Share on other sites
jazz 209 Posted November 14, 2013 Author Share Posted November 14, 2013 Just note that MSP430F5xx USB devices with 25 MHz, are also able to work with USB using 25 MHz XT2. TI didn't include 25 MHz constant in "msp430f5510.h", so just add following line to your source code. #define USBPLL_SETCLK_25_0 0618h Quote Link to post Share on other sites
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