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DSPIC33FJ32GP302TH/SP Datasheet(PDF) 130 Page - Microchip Technology |
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DSPIC33FJ32GP302TH/SP Datasheet(HTML) 130 Page - Microchip Technology |
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130 / 403 page  dsPIC33FJ32GP302/304, dsPIC33FJ64GPX02/X04, AND dsPIC33FJ128GPX02/X04 DS70292D-page 130 Preliminary 2009 Microchip Technology Inc. The DMA controller features eight identical data transfer channels. Each channel has its own set of control and status registers. Each DMA channel can be configured to copy data either from buffers stored in dual port DMA RAM to peripheral SFRs, or from peripheral SFRs to buffers in DMA RAM. The DMA controller supports the following features: • Eight DMA channels • Register Indirect With Post-increment Addressing mode • Register Indirect Without Post-increment Addressing mode • Peripheral Indirect Addressing mode (peripheral generates destination address) • CPU interrupt after half or full block transfer complete • Byte or word transfers • Fixed priority channel arbitration • Manual (software) or Automatic (peripheral DMA requests) transfer initiation • One-Shot or Auto-Repeat block transfer modes • Ping-Pong mode (automatic switch between two DPSRAM start addresses after each block trans- fer complete) • DMA request for each channel can be selected from any supported interrupt source • Debug support features For each DMA channel, a DMA interrupt request is generated when a block transfer is complete. Alternatively, an interrupt can be generated when half of the block has been filled. FIGURE 8-1: TOP LEVEL SYSTEM ARCHITECTURE USING A DEDICATED TRANSACTION BUS CPU SRAM DMA RAM CPU Peripheral DS Bus Peripheral 3 DMA Peripheral Non-DMA SRAM X-Bus PORT 2 PORT 1 Peripheral 1 DMA Ready Peripheral 2 DMA Ready Ready Ready DMA DS Bus CPU DMA CPU DMA CPU DMA Peripheral Indirect Address DMA Controller DMA Channels Note: CPU and DMA address buses are not shown for clarity. |
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