AVR-Chat

i'm trying to get a 30Hz pulse out of timer 1.  i initialize it as
follows...
//
//  set up timer 1, ca 30Hz, fast pwm mode 15, prescale = 64, top =
8333, no interrupts
//
  TCCR1B = 0;                             // stop timer 1
  TIMSK1 = 0;                             // disable all interrupts on
timer 1
  TCCR1A = (1 << WGM11) | (1 << WGM10);   // disconnect output compare
pins
  OCR1A = 8333;                           // freq = 16M / 64 / 8333,
ca 30Hz
  TCCR1B = (1 << CS11) | (1 << CS10) |    // start timer one with
prescale = 64 and ...
           (1 << WGM13) | (1 << WGM12);   // ... fast pwm mode 15

then to get a 1 Hz pulse on PD7 i test TOV1 in my main loop as follows


if (TIFR1 & (1 << TOV1)) {             // timer1 overflow ?
  TIFR1 &= ~(1 << TOV1);               // clear timer1 overflow
  if (++t1Count == 15) {
    PORTD ^= 0x80;
    t1Count = 0;
  }
}

instead i get a very rapid flicker on the led i have connected.  i
suspect my timer math, but i've gone over it again and again and don't
see what's wrong.