Using as many internal peripherals as possible.

[HenrikOlsson]

How about this?

Main:
  n = n + INTCON.2
  INTCON.2 = 0

  IF n.3 THEN
      LATA = LATA ^ %000011
      n=0
  ENDIF

  goto Main

It won't produce exactly the same frequency as your example but it's 12% smaller (37 words). I suppose there's also the odd chance/risk of the TMR0 interrupt bit being set in between checking it and clearing it. You COULD also do away with the n=0 at the start with the drawback of the FIRST iteration taking longer depending on the start value of n. AND, possibly, get rid of the GOTO Main and let the PC freerun and start over from the top.

Adding DEFINE NO_CLRWDT 1 saves one or two words depending on which version.

Using TMR1, which is 16 bits with its 8:1 prescaler instead of counting overflows should achieve similar results

T1CON = %00110001

Main:
IF PIR1.0 THEN
    PIR1.0 = 0
    LATA = LATA ^ %000011
ENDIF

Goto Main

Combining these I got it down to 34 words but have not checked if it actually works.

/Henrik.

[louislouis]

I tested your codes, both works. The second example with TMR1 I like the most because maintain 4MHz clock. And yes, it compiles only 34 words. Just one more word than mine when I manipulate the clock speed.
Nice.