I'm modified my code as follows (in bold) and unfortunately, I doesn't work at all now (now PWM signal).
Code:
' Fuses PIC18F1330 for MPASM
@ __CONFIG _CONFIG1H, _OSC_HS_1H     & _FCMEN_OFF_1H   & _IESO_OFF_1H
@ __CONFIG _CONFIG2L, _PWRT_OFF_2L   & _BOR_OFF_2L     & _BORV_0_2L
@ __CONFIG _CONFIG2H, _WDT_OFF_2H    & _WDTPS_512_2H
@ __CONFIG _CONFIG3L, _HPOL_HIGH_3L  & _LPOL_HIGH_3L   & _PWMPIN_OFF_3L
@ __CONFIG _CONFIG3H, _FLTAMX_RA7_3H & _T1OSCMX_LOW_3H & _MCLRE_OFF_3H
@ __CONFIG _CONFIG4L, _STVREN_ON_4L  & _BBSIZ_BB256_4L & _XINST_OFF_4L & _DEBUG_OFF_4L
@ __CONFIG _CONFIG5L, _CP0_OFF_5L    & _CP1_OFF_5L
@ __CONFIG _CONFIG5H, _CPB_OFF_5H    & _CPD_OFF_5H
@ __CONFIG _CONFIG6L, _WRT0_OFF_6L   & _WRT1_OFF_6L
@ __CONFIG _CONFIG6H, _WRTC_OFF_6H   & _WRTB_OFF_6H    & _WRTD_OFF_6H
@ __CONFIG _CONFIG7L, _EBTR0_OFF_7L  & _EBTR1_OFF_7L
@ __CONFIG _CONFIG7H, _EBTRB_OFF_7H    

'==========================================================================
' Main Registers
'          76543210
'OSCCON  = %00000000 'OSCILLATOR CONTROL REGISTER
'OSCTUNE = %00000000 'OSCILLATOR TUNING REGISTER
ADCON0  = %00000000 'A/D CONTROL REGISTER 0
ADCON1  = %00000000 'A/D CONTROL REGISTER 1
ADCON2  = %00000000 'A/D CONTROL REGISTER 2
INTCON  = %00000000 'INTERRUPT CONTROL REGISTER
INTCON2 = %00000000 'INTERRUPT CONTROL REGISTER 2
INTCON3 = %00000000 'INTERRUPT CONTROL REGISTER 3
TRISA   = %00000000 'Data Direction Control Register (Input/Output)
PORTA   = %00000000 'State High (1) or Low (0)
TRISB   = %00000000 'Data Direction Control Register (Input/Output)
PORTB   = %00000000 'State High (1) or Low (0) 

' Set up PWM1 (PORTB.1)
T0CON   = %00000000
T1CON   = %01001010
PTCON0  = %00000000 'Postscale 1:1, Fosc/4 Prescale 1:1, Free Running Mode
PTCON1  = %10000000 'Time base in ON, Time base counts up
PWMCON0 = %00010000 'PWM1 enabled
PDC0H   = 30        'Duty Cycle control for PWM0/1
PTMRL   = %00000000
PTMRH   = %00000000
PTPERL  = %00110011 ' = 51
PTPERH  = %00000000

DEFINE OSC 8

LED var PORTA.2
'PORTB.1 is PWM1

MAIN:
    TOGGLE LED
    PAUSE 500
    GOTO MAIN

END