[Ktechlab-devel] instruction cycles

[David Saxton]

There was a bug in the oscilloscope which meant it didn't show anything when 
zoomed in.

After fixing that though, I tested your example programs, and they behave as 
they should (see oscilloscope outputs program1.png, program2.png for the 
first and second programs respectively).

On Friday 17 February 2006 14:28, deifo at ono.com wrote:
> Recently I was experimenting with little programs and KTechLab, but
> sometimes strange things happen.
> For example, why is this program producing a perfect square wave in RA4
> output?
>
> loop:
>     BSF       PORTA, 4
>     BCF       PORTA,4
>     GOTO      loop
>
> According to the pic specification, GOTO should take 2 cycles and B?F
> should take only 1 cycle.
>
> To correct this, we must add two NOP's after BSF, is this correct?
> With this little program we should have a perfect square wave on the RA4
> pin.
>
> loop:
>     BSF       PORTA, 4
>     NOP
>     NOP
>     BCF       PORTA,4
>     GOTO      loop
>
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