Main Clock Status

Name:
MCLKSTATUS
Offset:
0x05
Reset:
0x00
Access:
-
 Bit7 6 5 4 3 2 1 0 PLLS EXTS XOSC32KS OSC32KS OSCHFS SOSC Access R R R R R R Reset 0 0 0 0 0 0

## Bit 5 – PLLS: PLL Status

PLL Status

ValueDescription
0 PLL is not running
1 PLL is running

## Bit 4 – EXTS: External Crystal/Clock Status

External Crystal/Clock Status

ValueDescription
0

The external high-frequency crystal is not stable when the Source Select (SELHF) bit in the External High-Frequency Oscillator Control A (CLKCTRL.XOSCHFCTRLA) register is ‘0’.
The external high-frequency clock is not running when the SELHF bit is ‘1’.

1

The external high-frequency crystal is stable when the SELHF bit is ‘0’.
The external high-frequency clock is running when the SELHF bit is ‘1’.

## Bit 3 – XOSC32KS: XOSC32K Status

XOSC32K Status

ValueDescription
0

The external 32.768 kHz crystal is not stable when the Source Select (SEL) bit in the 32.768 Crystal Oscillator Control A (CLKCTRL.XOSC32K) register is ‘0’.
The external 32.768 kHz clock is not running when the SEL bit is ‘1’.

1

The external 32.768 kHz crystal is stable when the SEL bit is ‘0’.
The external 32.768 kHz clock is running when the SEL bit is ‘1’.

## Bit 2 – OSC32KS: OSC32K Status

OSC32K Status

ValueDescription
0 OSC32K is not stable
1 OSC32K is stable

## Bit 1 – OSCHFS: Internal High-Frequency Oscillator Status

Internal High-Frequency Oscillator Status

ValueDescription
0 OSCHF is not stable
1 OSCHF is stable

## Bit 0 – SOSC: Main Clock Oscillator Changing

Main Clock Oscillator Changing

ValueDescription
0 The clock source for CLK_MAIN is not undergoing a switch
1 The clock source for CLK_MAIN is undergoing a switch and will change as soon as the new source is stable