| 摘要 |
There is disclosed a system LSI capable of dynamically and speedily controlling clocks of various frequencies as used in the wide range of operation mode, from the high-speed operation mode to the low-speed one and, in addition, enabling the user to select a system of the low power consumption type, which is most suitable for his own system. The system LSI includes a ROM 551 storing a clock control library for carrying out the clock state transition between the ordinary operation modes, and a system control circuit 534 having a register and carrying out the clock state transition between the ordinary operation mode and the special mode in response to the change of the value of the register, and also carrying out the clock state transition among the ordinary operation modes in response to the clock control library. The call of the clock control library and change of the register value are controlled by the application program. The main library of the clock control library is described in the C language and is called by also using the C language.
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