The T0CS bits are used to select the clock source for Timer0. The possible clock sources are listed in the table below.
| T0CS | Clock Source | 
|---|---|
| 111 | Reserved | 
| 110 | Reserved | 
| 101 | SOSC | 
| 100 | LFINTOSC | 
| 011 | HFINTOSC | 
| 010 | Fosc/4 | 
| 001 | Pin selected by T0CKIPPS (Inverted) | 
| 000 | Pin selected by T0CKIPPS (Non-inverted) |