Nxp B.v.

Jay Richard Lory

Alma Anderson

A system and method for synchronizing otherwise independent oscillators private to IC Bus slave devices. An IC Bus master device can issue two new general call commands, CALIBRATE and ZERO COUNTERS. The IC Bus slave devices respond to the CALIBRATE command by counting the number of cycles its local, private oscillator makes through during the communication transfer period of the CALIBRATE command on the IC Bus. All such IC Bus slave devices measure the same communication transfer period on the IC Bus, so the differences in the digital measurements obtained by each of them are proportional to their respective oscillator frequencies. The digital measurements are privately used by each IC Bus slave device to calculate appropriate oscillator prescale factors, and to automatically load the values that will harmonize the final product frequencies of all of the local oscillators on all of the IC Bus slave devices in the system.

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A system and method for synchronizing otherwise independent oscillators private to IC Bus slave devices. An IC Bus master device is capable of issuing two new general call commands, MEASURE PULSE and RESET PRESCALE. The IC Bus slave devices respond to the MEASURE PULSE command by returning a digital count related to the number of ticks its local, private oscillator cycles through during a signal pulse on the IC Bus. All such IC Bus slave devices measure the same signal pulse on the IC Bus, so the differences in the digital measurements returned during the MEASURE PULSE command are proportional to their respective oscillator frequencies. The various digital measurements returned are used to calculate appropriate oscillator prescale factors that will harmonize the final product frequencies of all of the local oscillators on all of the IC Bus slave devices in the system.

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Chandler, AZ, United States of America

Jay Richard Lory