You mention you have successfully used LLWU module to get out from LLS mode by external pin trigger but now you would like to do the same but using a UART_RX signal instead external signal trigger, as it's mentioned on AWIC module but I am afraid this is not possible because the LLWU module has been designed specifically to wake up from LLS mode and AWIC module has been designed to get out from STOP and VLPS modes.
Please verify this information on diagrams which describe the interactions for LLWU (Figure 16-1. LLWU block diagram) and AWIC (Figure 9-1. Cortex-M4 Debug Topology) in the reference manual K20P64M50SF0RM. You will notice that wake up sources from AWIC (Table 3-7. AWIC Stop and VLPS Wake-up Sources) are completely different from wake up sources of LLWU (Table 3-13. Wakeup sources for LLWU inputs).
Please let me know if this information is useful or if I have understood your issue.
Have a nice day :P,
Perla
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