Resuming piecewise calibration of a real-time-clock unit after a measured offset that begins at the next calibration period

Circuitry which calibrates a module whose operation is based on a module clock signal, comprising a microcontroller configured to perform:

• over each calibration period of a plurality of the calibration periods, obtaining a frequency of an observed signal by counting features of the observed signal, the observed signal being the module clock signal or a clock signal generated based upon the module clock signal;
• configuring an operation of the module based on the obtained frequency to calibrate the module;
• and
• for each calibration period, taking account of a first position in time of an end of each calibration period relative to a first particular feature of the observed signal and delaying a start of a calibration period following each calibration period relative to a second particular feature of the observed signal subsequent to the first particular feature of the observed signal based on the first position.

A mobile communication device, or an automobile, or an industrial robot, comprising circuitry which calibrates a module whose operation is based upon a module clock signal including a microcontroller configured to perform:

• over each calibration period of a plurality of the calibration periods, obtaining a frequency of an observed signal by counting features of the observed signal, the observed signal being the module clock signal or a clock signal generated based upon the module clock signal;
• configuring an operation of the module based upon the obtained frequency to calibrate the module;
• and
• for the each calibration period, taking account of a first position in time of an end of each calibration period relative to a first particular feature of the observed signal and delaying a start of a calibration period following each calibration period relative to a second particular feature of the observed signal subsequent to the first particular feature of the observed signal based upon the first position.