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

Bit 9 of PC is cleared by the "JMP PC+W" instruction. So the destination must be within the first 256 words of any 512 word page.

This is noted in the "SX Instruction Set" tables in the manual.

If you locate the "JMP PC+W" at a page boundary ($200, $400, etc), you can have at most 255 RETW #xx entries.

You might want to use the IREAD instruction instead.

Bean

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