AT32UC3A3256 Atmel Corporation, AT32UC3A3256 Datasheet - Page 324
AT32UC3A3256
Manufacturer Part Number
AT32UC3A3256
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT32UC3A0128.pdf
(377 pages)
2.AT32UC3A0128.pdf
(33 pages)
3.AT32UC3A0128.pdf
(159 pages)
4.AT32UC3A3128.pdf
(91 pages)
5.AT32UC3A3128.pdf
(1012 pages)
Specifications of AT32UC3A3256
Flash (kbytes)
256 Kbytes
Pin Count
144
Max. Operating Frequency
66 MHz
Cpu
32-bit AVR
# Of Touch Channels
32
Hardware Qtouch Acquisition
No
Max I/o Pins
110
Ext Interrupts
110
Usb Transceiver
1
Usb Speed
Hi-Speed
Usb Interface
Device + OTG
Spi
6
Twi (i2c)
2
Uart
4
Lin
4
Ssc
1
Sd / Emmc
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
384
Resistive Touch Screen
No
Dac Channels
2
Dac Resolution (bits)
16
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
128
Self Program Memory
YES
External Bus Interface
1
Dram Memory
sdram
Nand Interface
Yes
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
3.0 to 3.6
Operating Voltage (vcc)
3.0 to 3.6
Fpu
No
Mpu / Mmu
Yes / No
Timers
6
Output Compare Channels
18
Input Capture Channels
12
Pwm Channels
12
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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- AT32UC3A0128 PDF datasheet
- AT32UC3A0128 PDF datasheet #2
- AT32UC3A0128 PDF datasheet #3
- AT32UC3A3128 PDF datasheet #4
- AT32UC3A3128 PDF datasheet #5
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19.8.2.1
Figure 19-6. External DMA Request Timing
19.9
32072G–11/2011
nDMAREQx
DMACA Transfer Types
dma_ack
dma_req
Hclk
External DMA Request Definition
When an external slave peripheral requires the DMACA to perform DMA transactions, it commu-
nicates its request by asserting the external nDMAREQx signal. This signal is resynchronized to
ensure a proper functionality (see
The external nDMAREQx signal should be asserted when the source threshold level is reached.
After resynchronization, the rising edge of dma_req starts the transfer. An external DMAACKx
acknowledge signal is also provided to indicate when the DMA transfer has completed. The
peripheral should de-assert the DMA request signal when DMAACKx is asserted.
The external nDMAREQx signal must be de-asserted after the last transfer and re-asserted
again before a new transaction starts.
For a source FIFO, an active edge should be triggered on nDMAREQx when the source FIFO
exceeds a watermark level. For a destination FIFO, an active edge should be triggered on
nDMAREQx when the destination FIFO drops below the watermark level.
The source transaction length, CTLx.SRC_MSIZE, and destination transaction length,
CTLx.DEST_MSIZE, must be set according to watermark levels on the source/destination
peripherals.
A DMA transfer may consist of single or multi-block transfers. On successive blocks of a multi-
block transfer, the SARx/DARx register in the DMACA is reprogrammed using either of the fol-
lowing methods:
On successive blocks of a multi-block transfer, the CTLx register in the DMACA is re-pro-
grammed using either of the following methods:
When block chaining, using linked lists is the multi-block method of choice, and on successive
blocks, the LLPx register in the DMACA is re-programmed using the following method:
• Block chaining using linked lists
• Auto-reloading
• Contiguous address between blocks
• Block chaining using linked lists
• Auto-reloading
• Block chaining using linked lists
DMA Transfers
DMA Transaction
DMA Transfers
”External DMA Request Timing” on page
DMA Transfers
324).
324
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