PWM - Dutycycle affecting frequency?

[flotulopex]

So, here's the code:

' Fuses
@ DEVICE PIC12F683,FCMEN_OFF
@ DEVICE PIC12F683,IESO_OFF
@ DEVICE PIC12F683,BOD_OFF
@ DEVICE PIC12F683,CPD_OFF
@ DEVICE PIC12F683,PROTECT_OFF
@ DEVICE PIC12F683,MCLR_OFF
@ DEVICE PIC12F683,WDT_OFF
@ DEVICE PIC12F683,INTRC_OSC_NOCLKOUT

'-------------------------------------------------------------------------------
' Registers   76543210
ANSEL      = %00000000  'Disable analog inputs
ADCON0     = %00000000  'ADC is OFF
CMCON0     = %00000111  'Comparator is OFF
OPTION_REG = %10000000  'Pull-Ups disabled...
TRISIO     = %00000000  'All PORTBs are Outputs
GPIO       = %00000000  'All PORTBs are Low

'-------------------------------------------------------------------------------
' Defines

'-------------------------------------------------------------------------------
' Variables

'-------------------------------------------------------------------------------
' Program
MAIN:
    PWM GPIO.2,64,1000
    goto main
end

And here is how the oscillo is set:
<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=1649&stc=1&d=117941075 3">