| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an electronic control device capable of deciding whether or not conversion by an A/D converter is executed without increasing a load on a microcomputer, and deciding whether a DMA (DirectMemory Access) controller is abnormal or not when having the DMA controller. <P>SOLUTION: This control device 7 has a CPU 700, a RAM 702, a DMAC 704, and the A/D converter 705. The A/D converter 705 stores a conversion result and an identifier that is information of a conversion execution frequency in conversion registers 705d-705f. The conversion result and the identifier are transferred to the RAM 702 not through the CPU 700 by the DMAC 704. The CPU 700 compares a value of the identifier with an expectation value of the identifier when reading the conversion result stored in the RAM 702, so that the CPU 700 can decide presence/absence of abnormality of the DMAC 704 and the A/D converter 705 without increasing the load. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
