Method of controlling clock signal

Details Method of controlling clock signal Method of controlling clock signal

2011-08-23

2011-08-23

Tsai, Carol S (Department: 2857)

Data processing: measuring, calibrating, or testing

Calibration or correction system

Signal frequency or phase correction

C327S156000, C327S158000, C327S263000, C323S313000, C331S016000, C331S057000

Reexamination Certificate

active

08005636

ABSTRACT:
A method of controlling a clock signal with a print controller is provided. In response to receiving an external signal, the print controller determines the number of cycles of a clock signal generated by a ring oscillator of the print controller during a predetermined number of cycles of the external signal or the number of cycles of the external signal during a predetermined number of cycles of the clock signal and outputs the determined number of cycles to an external circuit. In response to receiving a trim value from clock trim circuitry of the print controller which trims the frequency of the clock signal based on the determined number of cycles from the external circuit, the trim value is stored in memory of the print controller. The clock trim circuitry is controlled to trim the frequency of the clock signal generated by the ring oscillator using the trim value.

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