Clock signal control

Clock signal control circuitry comprising:

• means for selecting and outputting a current clock signal from two or more candidate clock signals;
• means for executing a clock signal change operation to select a different one of the two or more candidate clock signals for output as the current clock signal;
• means for generating a count value by counting clock pulses of the current clock signal multiplied by a scaling value;
• means for executing a scaling value change operation to change the scaling value in response to initiation of a clock signal change operation;
• and
• means for inhibiting the output of the current clock signal during a scaling value change operation.

A method comprising:

• selecting and outputting a current clock signal from two or more candidate clock signals;
• executing a clock signal change operation to select a different one of the two or more candidate clock signals for output as the current clock signal;
• generating a count value by counting clock pulses of the current clock signal multiplied by a scaling value;
• executing a scaling value change operation to change the scaling value in response to initiation of a clock signal change operation;
• and
• inhibiting the output of the current clock signal during a scaling value change operation.