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We have applied thoroughly clock gating technique to the SH-4A FPU (Floating Point Unit) core  while still keeping it co-operates with CPU core. As a result, 97% flip-flops in FPU is gated. And the power consumption is saved up to 78.11% in FPU, corresponding to 17.02% power consumption reducing of total CPU and FPU core in Dhrystone benchmark. This paper introduces such approach in which the clock is controlled thoroughly and provided to FPU only when the FPU instruction is under-processing.