AT32UC3B1256-Z1UR Atmel, AT32UC3B1256-Z1UR Datasheet - Page 402

• Manufacturer Part Number: AT32UC3B1256-Z1UR
• Description: MCU AVR32 256K FLASH 48-QFN
• Manufacturer: Atmel
• Series: AVR®32 UC3r

Specifications of AT32UC3B1256-Z1UR

• Package / Case: 48-QFN Exposed Pad
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Operating Temperature: -40°C ~ 85°C
• Speed: 60MHz
• Number Of I /o: 28
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 32K x 8
• Program Memory Size: 256KB (256K x 8)
• Data Converters: A/D 6x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Connectivity: I²C, IrDA, SPI, SSC, UART/USART, USB
• Core Size: 32-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

22.7.4.2
22.7.4.3
32059J–12/2010
USB DMA Channel X Registers
(Current Transfer Descriptor)
Next Descriptor Address
Memory Area
Data Buffer 1
Data Buffer 2
Data Buffer 3
HSB Address
Control
Status
DMA Channel descriptor
Programming a chanel:
Figure 22-30. Example of DMA Chained List
The DMA channel transfer descriptor is loaded from the memory.
Be careful with the alignment of this buffer.
The structure of the DMA channel transfer descriptor is defined by three parameters as
described below:
• Offset 0:
• Offset 4:
• Offset 8:
Each DMA transfer is unidirectionnal. Direction depends on the type of the associated endpoint
(IN or OUT).
Three registers, the UDDMAnNEXTDESC, the UDDMAnADDR and UDDMAnCONTROL need
to be programmed to set up wether single or multiple transfer is used.
The following example refers to OUT endpoint. For IN endpoint, the programming is symmetric.
– The address must be aligned: 0xXXXX0
– DMA Channel n Next Descriptor Address Register: DMAnNXTDESCADDR
– The address must be aligned: 0xXXXX4
– DMA Channel n HSB Address Register: DMAnADDR
– The address must be aligned: 0xXXXX8
– DMA Channel n Control Register: DMAnCONTROL
Next Descriptor Address
Transfer Descriptor
HSB Address
Control
Next Descriptor Address
Transfer Descriptor
HSB Address
Control
Next Descriptor Address
Transfer Descriptor
HSB Address
Control
AT32UC3B
NULL
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