NXP Semiconductors LPC1768 - DMA Software Single Request Register (Dmacsoftsreq - 0 X5000 4024); DMA Software Last Burst Request Register (Dmacsoftlbreq - 0 X5000 4028); DMA Software Last Single Request Register (Dmacsoftlsreq - 0 X5000 402 C)

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User manual Rev. 3 — 19 December 2013 599 of 841
NXP Semiconductors
UM10360
Chapter 31: LPC176x/5x General Purpose DMA (GPDMA)
31.5.10 DMA Software Single Request register (DMACSoftSReq - 0x5000
4024)
The DMACSoftSReq Register is read/write and enables DMA single transfer requests to
be generated by software. A DMA request can be generated for each source by writing a
1 to the corresponding register bit. A register bit is cleared when the transaction has
completed. Reading the register indicates which sources are requesting single DMA
transfers. A request can be generated from either a peripheral or the software request
register. Table 554
shows the bit assignments of the DMACSoftSReq Register.
31.5.11 DMA Software Last Burst Request register (DMACSoftLBReq - 0x5000
4028)
The DMACSoftLBReq Register is read/write and enables DMA last burst requests to be
generated by software. A DMA request can be generated for each source by writing a 1 to
the corresponding register bit. A register bit is cleared when the transaction has
completed. Reading the register indicates which sources are requesting last burst DMA
transfers. A request can be generated from either a peripheral or the software request
register. Table 555
shows the bit assignments of the DMACSoftLBReq Register.
31.5.12 DMA Software Last Single Request register (DMACSoftLSReq -
0x5000 402C)
The DMACSoftLSReq Register is read/write and enables DMA last single requests to be
generated by software. A DMA request can be generated for each source by writing a 1 to
the corresponding register bit. A register bit is cleared when the transaction has
completed. Reading the register indicates which sources are requesting last single DMA
transfers. A request can be generated from either a peripheral or the software request
register. Table 556
shows the bit assignments of the DMACSoftLSReq Register.
Table 554. DMA Software Single Request register (DMACSoftSReq - 0x5000 4024)
Bit Name Function
15:0 SoftSReq Software single transfer request flags for each of 16 possible sources. Each bit
represents one DMA request line or peripheral function:
0 - writing 0 has no effect.
1 - writing 1 generates a DMA single transfer request for the corresponding request
line.
31:16 - Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
Table 555. DMA Software Last Burst Request register (DMACSoftLBReq - 0x5000 4028)
Bit Name Function
15:0 SoftLBReq Software last burst request flags for each of 16 possible sources. Each bit represents
one DMA request line or peripheral function:
0 - writing 0 has no effect.
1 - writing 1 generates a DMA last burst request for the corresponding request line.
31:16 - Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.