SWCU193 April 2023 CC2340R2 , CC2340R5 , CC2340R5-Q1
The RAMs marked with ULL in Figure 22-1, which are used for storing firmware images, have ultra low leakage (ULL). ULL supports low power consumption while retaining the contents of these memories when entering standby. This avoids having to reprogram the firmware images after each standby. The other memories (S2RRAM, BUFRAM) have higher leakage and the power consumption of having retention on these in standby is higher. The S2RRAM is reserved for future use, and the BUFRAM is used for data that usually have a short lifespan, so retaining the contents of these is not necessary.
The Samples-to-RAM (S2R) module and S2RRAM are reserved for future use by RCL. Do not use S2RRAM as this can conflict with future features.