Retention RAM

Hi all,

Please let me ask the question about the usage for “Retention RAM” and “SysRAM(page0,1)”.
We are struggling to shrink code size. (RAM area (for code) is smaller than our thoughts… )
I’ve read the UM-B-011 document, but still I can’t have a confidence to use those area.

=My condition=
- Use Extended Sleep
- BLE_CONNECTION_MAX_USER = 1