pic tmr0 question

Hi,

There is a PIC16C620A microcontroller which is running at 16MHz. In which time intervals starts the TMR0 interrupt routine? I mean to

Here is a part of the program

TMR0_RELOAD equ 215 ;reload value for tmr0 .... movlw b'11011111' ;tmr0 clock is internal, prescaler -> wdt movwf OPTION_REG ..... movlw TMR0_RELOAD ;initialize tmr0 movwf TMR0 movlw b'10100000' ;enable tmr0 interrupt movwf INTCON ....

Thanks