PIC32MX440F256H-80I Datasheet, PDF (199/646 Pages) Microchip Technology – 64/100-Pin General Purpose and USB 32-Bit Flash Microcontrollers

10.0 DIRECT MEMORY ACCESS
(DMA) CONTROLLER
Note:
This data sheet summarizes the features of
the PIC32MX3XX/4XX family of devices. It
is not intended to be a comprehensive refer-
ence source. Refer to the “PIC32MX Family
Reference Manual” (DS61132) for a
detailed description of this peripheral.
The PIC32MX Direct Memory Access (DMA) controller
is a bus master module useful for data transfers
between different devices without the CPU interven-
tion. The source and destination of a DMA transfer can
be any of the memory mapped modules existent in the
PIC32MX (such as Peripheral Bus (PBUS) devices:
SPI, UART, I²C™, etc.) or memory itself.
Following are some of the key features of the DMA
controller module:
• Four Identical Channels, each featuring:
- Auto-Increment Source and Destination
Address Registers
- Source and Destination Pointers
• Automatic Word-Size Detection:
- Transfer Granularity, down to byte level
- Bytes need not be word-aligned at source
and destination
• Fixed Priority Channel Arbitration
• Flexible DMA Channel Operating Modes:
- Manual (software) or automatic (interrupt)
DMA requests
- One-Shot or Auto-Repeat Block Transfer
modes
- Channel-to-channel chaining
PIC32MX3XX/4XX
• Flexible DMA Requests:
- A DMA request can be selected from any of
the peripheral interrupt sources
- Each channel can select any (appropriate)
observable interrupt as its DMA request
source
- A DMA transfer abort can be selected from
any of the peripheral interrupt sources
- Pattern (data) match transfer termination
• Multiple DMA Channel Status Interrupts:
- DMA channel block transfer complete
- Source empty or half empty
- Destination full or half-full
- DMA transfer aborted due to an external
event
- Invalid DMA address generated
• DMA Debug Support Features:
- Most recent address accessed by a DMA
channel
- Most recent DMA channel to transfer data
• CRC Generation Module:
- CRC module can be assigned to any of the
available channels
- CRC module is highly configurable
TABLE 10-1: DMA CONTROLLER FEATURES
<= 256B
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
© 2008 Microchip Technology Inc.
Preliminary
DS61143E-page 197