In SX Microcontrollers, SX/B Compiler and SX-Key Tool, hainguyen51 wrote:

Hi Bean,
 

I tried the codes you suggest. What I expect to see is as soon as I send a + slope rb.0 for example, I should see a permanent "hi" signal on rc.0. The reality is I just saw a short hi pulse then rc.0 turns "lo" right away. Please advise.

 

Thanks

Hai

 

 

  

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  ; Prepare to use WKPND_B register
  MOV W,#$00  ; Assume all bits off initially 


  MOV !RB,W    ; Zero all edge detection bits

  NOP              ; Might be needed ???

;
main
  MOV !RB,W ; This will put the register bits in W
  TEST W     ; Is W zero ?

  SZ            ; Yes, then no edges detected, so skip SETB

  SETB RC.0  ; Edge detected so set RC.0

  JMP main 


Bean

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