interrupt handling

Hello,

I need some help with the interrupt handling on a C-167 controller. In this case, the timer T3 is started (in Timer Mode) and works.
The period time is about 1s, in this cycle comes the reset from the watchdog.. So, there is no access to the interrupt routine.
See someone my mistake or the missing thing?

Dietmar


....
/* set Timer und Interrupt Register */
DP3_3 = 1;
T3IC = 0x44;
T3 = 0x0;
IEN = 1;
T3CON = 0x0646; /* start */
....



#include <reg167.h> /* special function register 80C167 */


void timer(void) interrupt 0x23 {


P3_2 = !P3_2;

}