In recent years, Internet of Things (IoT) are spread out in many fields. Some applications for an IoT request intermittent operations to extend their battery life. In this paper, we present a nonvolatile flip-flop (NV-FF) using FiCC (Fishbone-in-Cage Capacitor) suitable for IoT processors with intermittent operations. The NV-FF was fabricated in a 180 nm CMOS process technology. The area overhead from the nonvolatility of bit cells is 29\\%. We confirmed full functionality of the NV-FF at 65 MHz. The data retention time was about 155 minutes when the write time to the nonvolatile memory was 0.1 seconds and the reading voltage was set to 1.4 V. The simulation results show that the nonvolatile resister file composed of the NV-FFs can reduce the energy consumption by 80.31\\% compared to a conventional register file when it operates 35 sec. per hour and hybernates in the remaining time.