In the 144 pin 100MHz K60, the FB_CLKOUT signal could be muxed out on PTC3 as ALT5. In the K60P144M150, the FB_CLKOUT doesn't appear in either the reference manual (Rev 2) or the datasheet (Rev 4). The ref manual shows PTC3-ALT5 as undefined and the datasheet shows it as CLKOUT (as in system clock out, same as PTA6-ALT5). Where is FB_CLKOUT now? Are both docs wrong?