PWM on PIC16F88

[mister_e]

I'll bet at least on the configuration fuses settings... AND... is there any specific reason why you want to run your PIC @ 32KHz?

i didn't did the calc, but i feel your current setting doesn't work anyways...

try the following

        list p=16f88
        INCLUDE "p16f88.inc"

        ;       Program Configuration Register 1
        __CONFIG    _CONFIG1, _CP_OFF & _CCP1_RB0 & _DEBUG_OFF & _WRT_PROTECT_OFF & _CPD_OFF & _LVP_OFF & _BODEN_OFF & _MCLR_OFF & _PWRTE_OFF & _WDT_OFF & _INTRC_IO
        
        ;       Program Configuration Register 2
        __CONFIG    _CONFIG2, _IESO_OFF & _FCMEN_OFF

        errorlevel -302         ; disable ' ensure .. bank pouet pouet' warning message

        BANKSEL OSCCON
        MOVLW   B'01100000'
        MOVWF   OSCCON          ; 4 MHz INT CLOCK MODE
        BTFSS   OSCCON,IOFS     ; wait 'till int osc is stable 
        GOTO    $-1
        
        BANKSEL PORTB           
        CLRF PORTB              ; Clear all 
        CLRF PORTA              ; outputs
        
        BANKSEL TRISA
        CLRF TRISA              ; all pins set to output
        CLRF TRISB              ;

        BANKSEL ANSEL
        CLRF ANSEL              ; Disable all ADCs
        
                ;
                ;       PWM Setup
                ;       ---------
        BANKSEL PR2
        movlw .249              ; ~250Hz PWM FREQUENCY
        movwf PR2

        BANKSEL T2CON
        movlw b'00000111'       ; prescaler 1:16, Timer2=on
        movwf T2CON

        BANKSEL CCP1CON
        movlw b'00001100'       ; pwm mode
        movwf CCP1CON

Start
        BANKSEL CCPR1L
        movlw .250
        movwf CCPR1L            ; set duty cycle to ~max, 100%
        
Loop1   ;   ((10+bananas) *250) uSec delay loop
        ;   to provide slower fading effect
        goto $+1    
        goto $+1        
        goto $+1
        goto $+1
        goto $+1
        DECFSZ  W,F
        GOTO    Loop1
       
        decfsz CCPR1L,F         ; dimming led by varying the duty cycle
        goto Loop1
        goto Start
        end

Sorry, ASM is really not my cup of tea So i'll not be surprised if some comes with a better solution, or with some constructive comments on the above (apart that i should care a little bit more about the bank switching... i feel there's a few useless BANKSEL here and there... that's what happen when you're lazy )

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Please, next time, try to not double, triple post the same question on various forum section.