Real-time clock apparatus, a semiconductor device, and an electrical apparatus including the real-time clock apparatus

Abstract

A real-time clock apparatus, a semiconductor device realizing the real-time clock apparatus, and an electrical apparatus using the real-time clock apparatus are disclosed. The real-time clock apparatus includes a crystal oscillation circuit, a high-speed timing circuit for dividing an output of the crystal oscillation circuit, a low-speed timing circuit for dividing an output of the high-speed timing circuit, and an interface unit for exchanging a signal with an external apparatus. The crystal oscillation circuit is driven by a first voltage VR1 the high-speed timing circuit is driven by a second voltage VR2, and the low-speed timing circuit and the interface unit are driven by a third voltage VDD, wherein VR1<VR2<VDD. The first voltage VR1 and the second voltage VR2 are generated from the third voltage VDD.

Dependencies are inferred from the claim text.