Timer1 also has a prescaler that offers four options which allow 1:1, 1:2, 1:4, or 1:8 divisions of the clock input. The Timer1 Clock Prescaler (T1CKPS) bits of the T1CON register control the prescale counter. The prescale counter is not directly readable or writable. However, the prescaler counter is cleared upon a write to TMR1H or TMR1L.