DATA SAVING SYSTEM, DATA RETURNING SYSTEM, DATA SAVING METHOD AND DATA RETURNING METHOD

摘要

A data saving system and a data returning system are provided for making it possible to reduce power consumed at a data saving process or a data returning process. A data transfer system is provided with a function block having saving data; a memory unit for storing the saving data transferred from the function block; a bus with which the function block and the memory unit are connected; and a control unit for sending a saving period clock to the function block and the memory unit at the data saving process time and a returning period clock to the function block and the memory unit at a data returning time. In synchronization with the saving period clock, the function block sends out the saving data every predetermined bit numbers in a bus bit width number and the memory unit stores the saving data sequentially sent by the function block through the bus. In synchronization with the returning period clock, the memory unit sends out the stored saving data every bus bit width numbers to the bus, the function block reads out the saving data every predetermined bit numbers from the bus.