Disclosed herein is a card having a controller and a clock control circuit. The controller incorporates a core logic, and the clock control circuit incorporates a PLL. When a card becomes idle to wait for commands, the clock control circuit stops the supply of a clock signal to the core logic. The clock...http://www.google.de/patents/USRE40147?utm_source=gb-gplus-sharePatent USRE40147 - Memory card device including a clock generator
