MICROPROCESSOR AND DATA PROCESSING SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide the microprocessor which can minimize a decrease in data processing efficiency or an increase in power consumption because of refreshing operation. SOLUTION: The microprocessor 1 which has a CPU 2 and DRAMs(dynamic RAM) 6 to 9 on a chip has a DRAM controller 10 which inhibits the DRAMs 6 to 9 from being refreshed individually according to control information set by the CPU 2. When refreshing operation is not needed like a period wherein data are processed while the DRAMs are accessed regularly and successively exceeds a refreshment interval, no interruption for refreshing operation is initiated halfway during the data processing by canceling the refreshing operation of the DRAMs, thereby suppressing a decrease in data processing efficiency or an increase in the power consumption resulting from unnecessary refreshing operation.