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

Thanks gentlemen, you've cleared up a serious point of confusion. :-) That AppNote is the handiest doc I've seen in days.

A few points I wish to have clarified then:

- an input wakeup, then, is essentially a "soft" reset, and I can take advantage of unchanged registers and the PD and TO bits to decide what to do differently from a hard reset (if I choose), keeping in mind that some registers will be unchanged from before the sleep state (rather than undefined as they might be on powerup).

- since I use SX/B for the startup and main portions of my code, and ASM for the nitty-gritty, I would presume that an  input wakeup will skip the powerup portion of SX/B's startup code

- in SX/B if I write:

WKPND_B = %0000_00000

In my src file I see:

  MODE $09                       ; clear pending
  MOV !RB,#%0000_0000          
  
Bean, it sounds like you are saying the above is really a compound instruction, e.g.:

MODE $09
MOV W, #0 ; set up W for swap
MOV !RB, W ; any move into WKPND swaps WKPND and W

This is done by the assembler?

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