リアルタイムクロック装置および該リアルタイムクロック装置を用いた半導体装置ならびに電子機器

Japanese Patent JP4787114

B2

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 VR 1 the high-speed timing circuit is driven by a second voltage VR 2, and the low-speed timing circuit and the interface unit are driven by a third voltage VDD, wherein VR 1