No, not trimmer... or timmer .... I really need to get a dictionary

Timer as in TMRO.

Many times we will at the beginning of a new project to make sure things are setup correctly we will do a simple "blinky" just like we tell the newbees to do. I will a lot of times leave it running as a "heart beat" type of thing. But if you do this using pauses to blink the LED the pauses will maybe get in the way.

So now comes a basic interrupt based on time.
This may or may not be correct for your chip so verify with the data sheet.
Code:
    INTCON.5 = 1    'ENABLE TMR0
    OPTION_REG = %10000101  '16BIT 1:64 PRESCALE
    ON INTERRUPT GOTO TLOOP

    MAINLOOP:
    'MAIN CODE GOES HERE
    GOTO MAINLOOP

    DISABLE
    TLOOP:
    INTCON.2=0:TOGGLE PORTD.4
    RESUME: ENABLE