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

Hi,
 

If anyone knows what's wrong with this code please let me know. I am sending o square signal of 1Hz into rb.0 and try to create a small pulse at rc.0 everytime the + slope comes along. I tried this and the output rc.0 is always = low. I am trying to figure out how the edge detection works first before I have a real application of delaying the signal at rb.0 appears at rc.0.

 

Thanks

Hai


device SX28L,OSCHS3,TURBO,STACKX_OPTIONX   
 id 'ECU103'
 reset start   ;Jump to reset_entry on reset.
 FREQ 50000000    ;50MHz target frequency.
;
;Define inputs, outputs, and registers
;
  ORG $00    ;Program start at address 00h.
interrupt
  RETI
;
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 ???
  MOV rc, #$00
;
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 
 JMP output
  JMP main
;
output
 SETB RC.0
 NOP
 NOP
 NOP
 NOP
 NOP
 NOP
 NOP
 NOP
 NOP
 NOP
 NOP
 NOP
 CLRB rc.0
  MOV W,#$00
 JMP main

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