Yes this the first time I used assembly for PIC, most of the time I used C.
if I want 1 ms on 20 Mhz processor with 1:64 prescaler ?
Something like this ?
*on init :*
clrf    TMR0            ;Set timer 0 to 0 - may not be needed

         clrwdt                ;Clear watchdog timer


         bsf     STATUS, RP0        ;SELECT BANK 1

         ; Set up timer interrupt
         movlw     b'10010110'        ;weak portb pullups disabled  -=20
1ms interrupt
         movwf     OPTION_REG        ;select tmr0, 64d prescal, clock sourc=
e

         bcf     STATUS, RP0        ;Select bank 0

         bcf         INTCON,RBIE        ; port B interrupt on change disabl=
e

         ;movlw      b'1010000'        ;enable global/timer0 interrupt
         movlw      b'10100000'        ;enable global/timer0 interrupt
         movwf     INTCON            ;
*for 1ms:*
     LedTimer EQU 0x0A

          clrf TMR0 ;Clear TMR0 and prescaler
                  banksel TMR0
                  movlw 0xB2 ;Count=3DB2
                  movwf TMR0

             timer1ms
               movf LedTimer,f
               btfsc STATUS,Z
               decf LedTimer,Z
          return
--=20
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