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question about DMA

Question asked by li.guocheng on May 4, 2014
Latest reply on May 4, 2014 by Clive One
I have an ISR, in which a DMA transfer will take place when the ISR is running. Although DMA transfer does not occupy CPU's running time, but occupies the Data bus. So will the DMA's existence lengthen the ISR's execution time? (In the ISR, some variables are read and write, and some calculations are carried out.) What kind of instruction's execution time will be influenced by DMA transfer, for example LDR & STR?