ENABLE=ENABLE, HF=LOW, BYPASS=CRYSTAL
Crystal oscillator control register
| ENABLE | Oscillator-pad enable. Do not change the BYPASS and ENABLE bits in one write-action: this will result in unstable device operation! 0 (ENABLE): Enable 1 (POWER_DOWN): Power-down (default) |
| BYPASS | Configure crystal operation or external-clock input pin XTAL1. Do not change the BYPASS and ENABLE bits in one write-action: this will result in unstable device operation! 0 (CRYSTAL): Crystal. Operation with crystal connected (default). 1 (BYPASS_MODE): Bypass mode. Use this mode when an external clock source is used instead of a crystal. |
| HF | Select frequency range 0 (LOW): Low. Oscillator low-frequency mode (crystal or external clock source 1 to 20 MHz). Between 15 MHz and 20 MHz, the state of the HF bit is don’t care. 1 (HIGH): High. Oscillator high-frequency mode; crystal or external clock source 15 to 25 MHz. Between 15 MHz and 20 MHz, the state of the HF bit is don’t care. |
| RESERVED | Reserved |