Datasheet

HTU
DCP[0]
DCP[1]
DCP[2]
DCP[3]
DCP[4]
DCP[5]
DCP[6]
DCP[7]
DMA
DMAREQ[20]
DMAREQ[21]
DMAREQ[24]
DMAREQ[25]
N2HET
DMAREQ[0]
HTUREQ[0]
DMAREQ[1]
HTUREQ[1]
DMAREQ[2]
HTUREQ[2]
DMAREQ[3]
HTUREQ[3]
DMAREQ[4]
HTUREQ[4]
DMAREQ[5]
HTUREQ[5]
DMAREQ[6]
HTUREQ[6]
DMAREQ[7]
HTUREQ[7]
www.ti.com N2HET Functional Description
23.2.9 N2HET Requests to DMA and HTU
As described in Section 23.5.3 the majority of the N2HET instructions are able to generate a transfer
request to the High End Timer Transfer Unit (HTU) and/or to the DMA module when an instruction-specific
condition is true. One N2HET instruction can select one of 8 request lines by programming the “reqnum”
parameter (see Section 23.5.3). The “request” field in an instruction is used to enable, disable, or to
generate a quiet request (see Section 23.5.2) on the selected request line. Quiet requests can be used by
the HTU, but not by the DMA. For quiet request please refer to the HTU users guide.
The configuration of the N2HET Request Destination Select Register (HETREQDS) bits determines if a
request line triggers an HTU-DCP, a DMA channel or both. This means the register bits will determine
whether an N2HET instruction triggers DMAREQ[x], HTUREQ[x] or both signals (shown in Figure 23-29).
The request line number x corresponds to the “reqnum” parameter used in the instruction.
Figure 23-29. Request Line Assignment Example
963
SPNU562–May 2014 High-End Timer (N2HET) Module
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