Semiconductor integrated circuit characterized by timing...

Details Semiconductor integrated circuit characterized by timing... Semiconductor integrated circuit characterized by timing...

2006-03-14

2006-03-14

Lee, Thomas (Department: 2115)

Electrical computers and digital processing systems: support

Clock, pulse, or timing signal generation or analysis

C713S400000

Reexamination Certificate

active

07013404

ABSTRACT:
The semiconductor integrated circuit capable of reducing the length of time required for clock switching is provided. The semiconductor integrated circuit includes a clock generation control circuit which is provided with a register capable of writing and reading specific data, and generates a frequency divided clock by inputting a reference clock with the timing of a clock frequency division setting signal. A clock control circuit constituting this semiconductor integrated circuit comprises a status shift circuit that controls clock frequency division/switching, a switching timing generation circuit that measures the timing with which a clock switch is made and a selection switching circuit that makes a switch between the reference clock and the frequency divided clock.

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