The oscillator type is selected by the FOSC bits of the configuration register:
| 11 | RC oscillator |
| 10 | HS oscillator |
| 01 | XT oscillator |
| 00 | LP oscillator |
Oscillator Types
- LP - Low Power Crystal
- XT - Crystal/Resonator
- HS - High Speed Crystal/Resonator
- RC - Resistor/Capacitor
LP - Low Power Crystal
XT - Crystal/Resonator
HS - High Speed Crystal/Resonator
RC - Resistor/Capacitor
HS, XT or LP Crystal or Ceramic Resonator Circuit
Ceramic Resonator
Capacitor Selection |
|---|
| Mode | Freq | C1, C2 |
|---|
| XT | 455 kHz | 47-100 pF |
|---|
| 2 MHz | 15-33 pF |
| 4 MHz | 15-33 pF |
| HS | 8 MkHz | 15-33 pF |
|---|
| 10 MHz | 15-33 pF |
Crystal Oscillator
Capacitor Selection |
|---|
| Mode | Freq | C1, C2 |
|---|
| LP | 32 kHz | 68-100 pF |
|---|
| 200 kHz | 15-33 pF |
| XT | 100 kHz | 100-150 pF |
|---|
| 2 MHz | 15-33 pF |
| 4 MHz | 15-33 pF |
| HS | 4 MHz | 15-33 pF |
|---|
| 20 MHz | 15-33 pF |
RC Circuit
