Control device capable of reducing power consumption and noise

Abstract

A control device that is capable of reducing power consumption and noise generation. The control device controls output of a clock signal to a data processing circuit that executes data processing in synchronism with the input clock signal. A switching section for switching the image output clock signal between a high-frequency clock signal and a low-frequency clock signal is controlled to output the high-frequency clock signal for data processing when the data processing is executed by the data processing circuit, and output the low-frequency clock signal when the data processing is not executed by the data processing circuit.

Description

technical field [0001] The invention relates to a control device for a data processing circuit. Background technique [0002] Conventionally, as a printer for printing image data, there has been proposed a printer that converts image data into multivalued image data by mode conversion using tables, then performs parallel-serial conversion on the multivalued image data, and converts the resulting The image data of is output to a printer engine (see, for example, Japanese Patent Application Laid-Open No. 2003-54032). [0003] In order to output the image data to the printer engine after parallel-serial conversion, it is necessary to control the driving of the data processing circuit by a high-frequency image output clock, in which, by controlling the original clock for image output (hereinafter referred to as The frequency of the "image output original clock") is multiplied (integer multiplied) to obtain the high-frequency image output clock. [0004] In addition, in terms o...

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Problems solved by technology

[0007] In the above-mentioned control of stopping and resuming the operation of the PLL, it is necessary to make the printer wait for the execution of image output until the lock time elapses, which results in time loss

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