Benjamin Menk=FCc wrote: >=20 > but it goes already to timer0_int so the bank should be right.... A= nd i am > pretty sure that my pic is not broken.. However i am doing isp debu= ggin... > might that be the reason? I just simulated that code with this simple program and it works ok, = so perhaps you have the WDT enabled, or something is wrong in the main loop. =09list P =3D 16F84 =09#include "p16f84.inc" =09ORG 0h =09goto start =09ORG 0x0004 =09btfsc INTCON,T0IF =09goto timer0_int =09goto end_int timer0_int =09movlw 0 =09movwf TMR0 =09bcf INTCON,T0IF =09goto end_int asdaa =09nop =09goto asdaa end_int =09retfie start=09bsf STATUS,RP0=09=09; prescale =3D 1:2 =09clrf OPTION_REG =09bcf STATUS,RP0 =09clrf INTCON =09bsf INTCON,T0IE=09=09; enable TMR0 IRQ =09bsf INTCON,GIE Loop=09nop =09nop =09goto Loop =09end --=20 Best regards Tony mICros http://www.bubblesoftonline.com mailto:sales@bubblesoftonline.com -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.