Microchip Technology megaAVR 0 Series Manual page 87

9.5.4 Main Clock Status
Name: MCLKSTATUS
Offset: 0x03
Reset: 0x00
Property: -
Bit 7
EXTS
Access R
Reset 0
Bit 7 – EXTS External Clock Status
Value Description
0 EXTCLK has not started
1 EXTCLK has started
Bit 6 – XOSC32KS XOSC32K Status
The Status bit will only be available if the source is requested as the main clock or by another module. If
the oscillator RUNSTDBY bit is set but the oscillator is unused/not requested, this bit will be 0.
Value Description
0 XOSC32K is not stable
1 XOSC32K is stable
Bit 5 – OSC32KS OSCULP32K Status
The Status bit will only be available if the source is requested as the main clock or by another module. If
the oscillator RUNSTDBY bit is set but the oscillator is unused/not requested, this bit will be 0.
Value Description
0 OSCULP32K is not stable
1 OSCULP32K is stable
Bit 4 – OSC20MS OSC20M Status
The Status bit will only be available if the source is requested as the main clock or by another module. If
the oscillator RUNSTDBY bit is set but the oscillator is unused/not requested, this bit will be 0.
Value Description
0 OSC20M is not stable
1 OSC20M is stable
Bit 0 – SOSC Main Clock Oscillator Changing
Value Description
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
©
2018 Microchip Technology Inc.
6 5
XOSC32KS OSC32KS
R R
0 0
4 3
OSC20MS
R
0
Datasheet Preliminary
®
megaAVR 0-Series
Clock Controller (CLKCTRL)
2 1
DS40002015A-page 87
0
SOSC
R
0