Importance

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Abstract

A clock dividing section receives a system clock and generates and outputs clock signals of two or more types. Selectors select any of the clock signals of two or more types outputted by the clock dividing section and feed it to a printing control block or reading control block. A decision divider monitors operational states of each block and gives control so that a frequency to be supplied to a functional block in an idle state where any operation is not required is lower than that to be supplied to a functional block being in an active state. Power consumption of the whole custom IC can be more reduced compared with a configuration wherein a clock of fixed frequency is constantly supplied to each functional block and a noise can be controlled.

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First Claim