SWRA486A August 2015 – April 2017 CC1310 , CC2620 , CC2630 , CC2640 , CC2640R2F-Q1 , CC2650 , CC2650MODA
The RTC is clocked from the low-frequency oscillator. The RTC can generate timed events to the Cortex-M3 and wake the device from idle or standby.
The TI-RTOS implementation is available in the Timer.c source file in the TI-RTOS installation:
C:\ti\tirtos_cc13xx_cc26xx_#_##_##_##\products\bios_#_##_##_##\packages\ti\sysbios\family\arm\cc26xx\Timer.c