INFORMATION PROCESSOR MOUNTED REAL TIME OS

摘要

PROBLEM TO BE SOLVED: To provide an information processor which speeds up data transfer between a cache memory and an external memory by using DMA transfer and transferring a task and data independently of the processing of a CPU or a DSP and on which a real time OS being applicable to a real time system where absolute time constraint is sever is mounted. SOLUTION: An interval timer processing part 201 updates the counter value for each task of an overlay area managing part 103 every time interval timer interrupt is made, and the overlay managing part 103 detects a shared area in a cache memory 105 for the currently executed execution task and the next time execution task to be next executed and notifies the data of the shared area to an execution DMA command issuing part 206 when the currently executed execution task is different from the task to be next carried out.