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

John,
  The value of "tmsg >> 8" is a constant that is evaluated when your code is assembled.
  Just like "idx+1".

  Let's assume that idx = 8 and tmsg = $123. The assembler would convert
  "MOV idx+1,#tmsg >> 8" into "MOV 9,#1"
  So you see the SX is not performing any math at all.

Bean.

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