HFXO Mode

0 (XTAL): 4-48 MHz crystal oscillator.

1 (BUFEXTCLK): An AC coupled buffer is coupled in series with HFXTAL_N, suitable for external sine wave (4-48 MHz). The sine wave should have a minimum of 200 mV peak to peak.

2 (DIGEXTCLK): Digital external clock on HFXTAL_N pin. Oscillator is effectively bypassed.

HFXO Start-up Boost Current

0 (50PCENT): 50 %.

1 (70PCENT): 70 %.

2 (80PCENT): 80 %.

3 (100PCENT): 100 % (default).

HFXO Boost Buffer Current

1 (BOOSTUPTO32MHZ): Boost Buffer Current level when HFXO is below or equal to 32 MHz.

3 (BOOSTABOVE32MHZ): Boost Buffer Current Level when HFXO is above 32 MHz.

HFXO Glitch Detector Enable

HFXO Timeout

0 (8CYCLES): Timeout period of 8 cycles.

1 (256CYCLES): Timeout period of 256 cycles.

2 (1KCYCLES): Timeout period of 1024 cycles.

3 (16KCYCLES): Timeout period of 16384 cycles.

LFXO Mode

0 (XTAL): 32.768 kHz crystal oscillator.

1 (BUFEXTCLK): An AC coupled buffer is coupled in series with LFXTAL_N pin, suitable for external sinus wave (32.768 kHz).

2 (DIGEXTCLK): Digital external clock on LFXTAL_N pin. Oscillator is effectively bypassed.

LFXO Start-up Boost Current

HFCLK Division

LFXO Boost Buffer Current

LFXO Timeout

0 (8CYCLES): Timeout period of 8 cycles.

1 (1KCYCLES): Timeout period of 1024 cycles.

2 (16KCYCLES): Timeout period of 16384 cycles.

3 (32KCYCLES): Timeout period of 32768 cycles.

Clock Output Select 0

0 (HFRCO): HFRCO (directly from oscillator).

1 (HFXO): HFXO (directly from oscillator).

2 (HFCLK2): HFCLK/2.

3 (HFCLK4): HFCLK/4.

4 (HFCLK8): HFCLK/8.

5 (HFCLK16): HFCLK/16.

6 (ULFRCO): ULFRCO (directly from oscillator).

7 (AUXHFRCO): AUXHFRCO (directly from oscillator).

Clock Output Select 1

0 (LFRCO): LFRCO (directly from oscillator).

1 (LFXO): LFXO (directly from oscillator).

2 (HFCLK): HFCLK (undivided).

3 (LFXOQ): LFXO (qualified).

4 (HFXOQ): HFXO (qualified).

5 (LFRCOQ): LFRCO (qualified).

6 (HFRCOQ): HFRCO (qualified).

7 (AUXHFRCOQ): AUXHFRCO (qualified).

Debug Clock

High-Frequency LE Interface