In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

The SX52 does have 262 bytes of SRAM, but it is banked (common practice in small micros) so you cannot use it as one contiguous block.   In the original program I wrote the SIRCS stuff was in an array (which moves it out of the normal variable area) for a reason: to keep the normal variable area as free as possible.

The SX52 is different from the SX28 and the program may require some updates to make it work on the new platform, especially with manual memory management as is required when using the ISR stuff.

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