Maxim-Integrated /max32672 /GCR /CLKCTRL

Prescaler Select. This 3 bit field sets the system operating frequency by controlling the prescaler that divides the output of the PLL0.

0 (div1): Divide by 1.

1 (div2): Divide by 2.

2 (div4): Divide by 4.

3 (div8): Divide by 8.

4 (div16): Divide by 16.

5 (div32): Divide by 32.

6 (div64): Divide by 64.

7 (div128): Divide by 128.

Clock Source Select. This 3 bit field selects the source for the system clock.

2 (ERFO): 32MHz Crystal is used for the system clock.

3 (INRO): 80kHz LIRC is used for the system clock.

4 (IPO): The internal 96 MHz oscillator is used for the system clock.

5 (IBRO): The internal 8 MHz oscillator is used for the system clock.

6 (ERTCO): 32kHz is used for the system clock.

7 (EXTCLK): External clock on gpio0 28 (AF4).

Clock Ready. This read only bit reflects whether the currently selected system clock source is running.

0 (busy): Switchover to the new clock source (as selected by CLKSEL) has not yet occurred.

1 (ready): System clock running from CLKSEL clock source.

Divides the HIRC96M clock before the system clock prescaler, will affect HIRC96M Autocalibration.

0 (div1): divide clock by 1

1 (div2): divide clock by 2

2 (div4): divide clock by 4

3 (div8): divide clock by 8

32MHz Crystal Oscillator Enable.

0 (dis): Is Disabled.

1 (en): Is Enabled.

96MHz High Frequency Internal Reference Clock Enable.

8MHz High Frequency Internal Reference Clock Enable.

8MHz High Frequency Internal Reference Clock Voltage Select. This register bit is used to select the power supply to the HIRC8M.

0 (1V): Dedicated 1v regulated supply.

1 (Vcor): VCore Supply

32MHz Crystal Oscillator Ready

0 (busy): Is not Ready.

1 (ready): Is Ready.

32kHz Crystal Oscillator Ready

0 (busy): Is not Ready.

1 (ready): Is Ready.

96MHz HIRC Ready.

8MHz HIRC Ready.

8kHz Low Frequency Reference Clock Ready.

External Clock (GPIO0[11] AF2)