SWCU193A April 2023 – August 2024 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 BUFRAM is used for data that usually have a short lifespan, so retaining the contents of these is not necessary. The S2RRAM is generally left unused.
If not used by the drivers and stacks provided by TI, the S2RRAM can be leveraged by the application. Consult the User’s Guide of the stack used to verify whether the S2RRAM is available. The User’s Guide also contains guidance on the way to use the S2RRAM, configure the build environment and on the precautions to take when using the S2RRAM.