usable size depends on the combination of the module used and softdevice. the usable size can be obtained by subtracting the amount of memory used by the system such as softdevice from the flash rom or ram size mounted on the bluetooth low energy ｍodule. for example, if s132 is used as softdevice with 512kb mk71521 flash rom and 64kb ram, flash rom 152kb and ram 20kb (system configuration dependent) are allocated to the system, so the sizes the application part of software can use are 360kb of flash rom and 44kb of ram.
