37.11 DMA support
Normally, the CMP generates a CPU interrupt if there is a change on the COUT. When
DMA support is enabled by setting C0[DMAEN] and the interrupt is enabled by setting
C0[IER], C0[IEF], or both, the corresponding change on COUT forces a DMA transfer
request rather than a CPU interrupt instead. When the DMA has completed the transfer, it
sends a transfer completing indicator signal that deasserts the DMA transfer request and
clears the flag to allow a subsequent change on comparator output to occur and force
another DMA request.
37.12 DAC functional description
This section provides DAC functional description.
37.12.1 Digital-to-analog converter block diagram
The following figure shows the block diagram of the DAC module. It contains a 256-tap
resistor ladder network and a 256-to-1 multiplexer, which selects an output voltage from
one of 256 distinct levels that outputs from DACO. It is controlled through the Control
register 1 (CMP_C1). Its supply reference source can be selected from two sources V
in1
and V
in2
. The module can be powered down or disabled when not in use. When in the
Disabled mode, DACO is connected to the analog ground.
DMA support
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