| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce steps of storing control information to a register, which digitally controls a clock signal generating part. <P>SOLUTION: This semiconductor integrated circuit includes a digital control signal generating part 10 to generate a clock signal CLKm, and a clock generating part equipped with a digital control part 20. The clock generating part is further equipped with a phase frequency comparator 31, and a control register 22. A reference signal CLKin and a feedback signal Mout are supplied to the comparator 31. The output signal FDout of the comparator 31 is supplied to the control resistor 22, and the control resistor 22 stores digital control information composed of a plurality of bits. The clock generating part is further equipped with a control data storage circuit 25 to store a plurality of initial setting data for a plurality of locking operations in advance. The initial setting data Sset1-Sset5 are stored in the high-order bits of the control resister 22 from the control data storage circuit 25 in response to operation selection information Min. <P>COPYRIGHT: (C)2009,JPO&INPIT |
