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

When you "read" the WKPND_B register (MODE $09), the bits get put into the W register (actually the register and W values are swapped).

So I'd try something like:

start
  MOV M,#$0F    ;Set up MODE register.
  MOV !RB, #$FF   ;Set $00 make RB all Inputs.
  MOV !RC, #$00   ;Set $00 make RC all Outputs.
  MOV M,#$0E    ;Set up MODE for PULL-UP configuration.
  MOV !RB, #$00   ;Set $00 make RB all inputs' Pullup.
  MOV !RC, #$00   ;Set $00 make RC all Outputs' Pullup.
;
  MOV M,#$0A
  MOV !RB, #$00   ;Set $00 make +slope detect at RB pins.
;
  MOV M,#$09
  MOV W,#$00
main
  MOV !RB,W ' This will put the register bits in W
  MOV RC,W ' Put edge detect status on RC pins
  JMP main


Bean

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