DMA COMMUNICATION CONTROLLING METHOD, TRANSFERRED DATA PROCESSING METHOD AND ENGINE CONTROLLER

摘要

PROBLEM TO BE SOLVED: To provide a DMA communication controlling method which is capable of preventing the delay of processing to be performed without synchronizing with time such as A/D conversion processing synchronizing with engine rotation and capable of reducing the processing load of a CPU. SOLUTION: This method includes a step for dividing time synchronizing data into two groups and requesting a DMAC 16 to process the time synchronizing data belonging to a former half group in synchronization with time, a step for requesting the DMAC 16 to process the time synchronizing data belonging to a latter half group in synchronization not with time but with a prescribed timing and a step for requesting the DMAC 16 to process the non-time synchronizing data in synchronization with the prescribed timing. The processing request for the non-time synchronizing data is preferential to that for the time synchronizing data.