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

JonnyMac,

I think your mistaken.
strAddr is a normal word variable that gets assigned the value of the passed parameter (__wparam12).
strIOByte is aliased to __param1

READINC reads a new value into strIOByte (eg. __param1)
which is tested for 0, and if not, calls TX_BYTE.
Now, because strIOByte is aliased to __param1
there is a redundant MOV __param1,strIOByte
prior to calling TX_BYTE. 
TX_BYTE destroys __param1 (eg. strIOByte)
but not strAddr and since strIOByte is not used
after calling TX_BYTE there is no problem.

regards peter

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