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Chapter 6
DMA Functions (DMA Controller)
User’s Manual U16580EE3V1UD00
6.3 DMA
Channel
Priorities
The DMA channel priorities are fixed as follows.
DMA channel 0 > DMA channel 1 > DMA channel 2 >... > DMA channel 7
6.4 DMA
Operation
6.4.1 DMA transfer of A/D converter result registers (ADC0, ADC1)
The DMAC has two dedicated channels to support DMA transfer for both A/D converters
independently, DMA channel 0 for A/D converter 0 and DMA channel 1 for A/D converter 1. As DMA
trigger factor, which requests and starts the DMA transfer, the end of conversion interrupt signal of the
corresponding A/D converter is pre-defined (INTADn) (n = 0, 1).
For each DMA trigger the data will be transferred from the A/D conversion result register for DMA
(ADDMAn) into the internal RAM specified as destination. While the source transfer address is fixed to
the ADDMAn register of the corresponding A/D converter (ADCn), the destination start address can be
set up to any even address in the internal RAM.
When the DMA transfer count of a DMA channel terminates, the DMA transfer is stopped and a
termination interrupt is generated. The maximum DMA transfer count is 256.
Since the DMA transfer is performed for each finished A/D conversion, it is possible to transfer more
than conversion results of one A/D converter scan sequence. However, the user has to take care that
the number of transfer counts complies with the product of A/D converter scan area size and the
number of A/D converter start triggers.
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