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

You can also code in SX/B if you like a BASIC like syntax. Examining the assembly that is "created" by the SX/B compiler might help you see how some of this stuff works.

This will probably do something like what you want, but I didn't count the cycles in the "wait" routine so I don't know how long it is.

[code]
device sx28l,oschs3

device turbo,stackx,optionx

IRC_CAL IRC_SLOW

reset start_point

freq 50000000 ; 50 MHz

org 8

second ds 2 ; counter for 1 second tone

delay ds 1

delay1 ds 1

              org 0

start_point   mov !rb,#$7F ; make led output

              call flashled

; wait for input button

bwait         jnb rb.0,bwait

              call flashled

              jmp bwait

; subroutine

flashled          mov second,#$d0 ; 2000 is $7D0

              mov second+1,#$07

             setb RB.7

loop          mov delay1,#24

oloop         clr delay

wloop         djnz delay,wloop

              djnz delay1,oloop

; repeat 2000 times

              djnz second,loop

              djnz second+1,loop

              clrb RB.7

              ret ; go back to wherever


[/code]

Remember that moving values to !RB or !RA or !AnyPort determines whether the pin(s) are INPUTS or OUTPUTS, not whether they are "high" or "low". In the above edit, the LED is set as an output, the bwait routine waits for the button to go high. When it does, it calls the flashled routine which sets the led output pin to 1 (high), counts down some loops to "delay" the light flash, then turns the LED off again. If your button is wired as active high to RB.0 and the anode (+ lead) of your LED is wired to RB.7, this should work.

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