Many times we are in the process of debugging or use the built-in clock
Note To plug-in crystal oscillator clock source to 32.768 to start-up:
small series to tell you a little trick, if you notice the print clock does not run, you can grab the crystal with an oscilloscope at both ends so there is no 32.768 a timing, if not first checked piece of hardware, if start-up look at a piece of software there is no clock source to boot two IO ports to handle it, like fans remember collection!
