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DSP56857 Datasheet(PDF) 8 Page - Freescale Semiconductor, Inc

Part # DSP56857
Description  Digitial Signal Controller
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

DSP56857 Datasheet(HTML) 8 Page - Freescale Semiconductor, Inc

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5685X Digital Signal Controller User Manual, Rev. 4
Freescale Semiconductor
vi
8.11.1
Interrupt Handshake Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-36
8.11.2
Interrupt Nesting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-37
Chapter 9
Direct Memory Access (DMA)
9.1
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
9.2
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
9.3
Signal Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
9.4
Module Memory Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5
9.5
DMA Controller Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-7
9.6
Register Descriptions (DMA_BASES = $1FFEC0, $1FFEC8, $1FFED0,
$1FFED8, $1FFEE0, $1FFEE8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-8
9.6.1
DMA Transfer Control (DMATC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-8
9.6.2
DMA Circular Queue Size (DMACQS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-10
9.6.3
DMA Transfer Count (DMACNT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-11
9.6.4
DMA Destination Address Low (DMADAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-11
9.6.5
DMA Destination Side Address High (DMADAH) . . . . . . . . . . . . . . . . . . . . . . . . . 9-12
9.6.6
DMA Source Address Low (DMASAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12
9.6.7
DMA Source Address High (DMASAH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12
9.7
Programming Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-13
9.7.1
Peripheral-to-Memory DMA Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-13
9.7.2
Memory-to-Memory DMA Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-14
9.7.3
Peripheral-to-Memory Circular Queue DMA Operation . . . . . . . . . . . . . . . . . . . . 9-15
Chapter 10
Serial Communications Interface (SCI)
10.1
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-3
10.2
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-3
10.3
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-4
10.4
External Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-4
10.4.1
Transmit Data (TXD) Pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-4
10.4.2
Receiver Data (RXD) Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-4
10.5
Module Memory Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-5
10.6
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-6
10.6.1
Data Frame Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-6
10.6.2
Baud Rate Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-7
10.6.3
SCI Transmitter Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-8
10.6.4
SCI Receiver Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
10.6.5
Single Wire Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
10.6.6
Loop Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20


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