AT32UC3A4256 Atmel Corporation, AT32UC3A4256 Datasheet - Page 856

• Manufacturer Part Number: AT32UC3A4256
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A4256

• Flash (kbytes): 256 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 66 MHz
• Cpu: 32-bit AVR
• Hardware Qtouch Acquisition: No
• Usb Transceiver: 1
• Usb Speed: Hi-Speed
• Usb Interface: Device + OTG
• Spi: 6
• Twi (i2c): 2
• Uart: 4
• Ssc: 1
• Sd / Emmc: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 128
• Self Program Memory: YES
• Dram Memory: No
• 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: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

30.7.16
Name:
Access Type:
Offset:
Reset Value:
• DMAEN: DMA Hardware Handshaking Enable
• CHKSIZE: DMA Channel Read and Write Chunk Size
• OFFSET: DMA Write Buffer Offset
32072G–11/2011
31
23
15
7
-
-
-
-
1: DMA Interface is enabled.
0: DMA interface is disabled.
To avoid unpredictable behavior, DMA hardware handshaking must be disabled when CPU transfers are performed.
To avoid data losses, the DMA register should be initialized before sending the data transfer command. This is also illustrated in
Figure 30-10 on page 824
The CHKSIZE field indicates the number of data available when the DMA chunk transfer request is asserted.
This field indicates the number of discarded bytes when the DMA writes the first word of the transfer.
DMA Configuration Register
CHKSIZE value
others
0
1
2
3
4
30
22
14
6
-
-
-
DMA
Read/Write
0x050
0x00000000
or
CHKSIZE
Figure 30-11 on page 826
29
21
13
5
-
-
-
Number of data transferred
28
20
12
16
32
4
1
4
8
-
-
-
-
27
19
11
3
-
-
-
-
Only available if FIFO_SIZE>= 16 bytes
Only available if FIFO_SIZE>= 32 bytes
Only available if FIFO_SIZE>= 64 bytes
Only available if FIFO_SIZE>= 128 bytes
Only available if FIFO_SIZE>= 256 bytes
Reserved
26
18
10
2
-
-
-
-
25
17
9
1
-
-
-
OFFSET
DAMEN
24
16
8
0
-
-
856