AT32UC3A3128 Atmel Corporation, AT32UC3A3128 Datasheet - Page 328

• Manufacturer Part Number: AT32UC3A3128
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A3128

• Flash (kbytes): 128 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

19.10 Programming a Channel
19.10.1
19.10.1.1
32072G–11/2011
Programming Examples
Single-block Transfer (Row 1)
programmed to zero in the end of block interrupt service routine that services the next-to-last
block transfer. This puts the DMACA into Row 1 state.
For rows 6, 8, and 10 (both CFGx.RELOAD_SR and CFGx.RELOAD_DS cleared) the user must
setup the last block descriptor in memory such that both LLI.CTLx.LLP_S_EN and
LLI.CTLx.LLP_D_EN are zero. If the LLI.LLPx register of the last block descriptor in memory is
non-zero, then the DMA transfer is terminated in Row 5. If the LLI.LLPx register of the last block
descriptor in memory is zero, then the DMA transfer is terminated in Row 1.
For rows 7 and 9, the end-of-block interrupt service routine that services the next-to-last block
transfer should clear the CFGx.RELOAD_SR and CFGx.RELOAD_DS reload bits. The last
block descriptor in memory should be set up so that both the LLI.CTLx.LLP_S_EN and
LLI.CTLx.LLP_D_EN are zero. If the LLI.LLPx register of the last block descriptor in memory is
non-zero, then the DMA transfer is terminated in Row 5. If the LLI.LLPx register of the last block
descriptor in memory is zero, then the DMA transfer is terminated in Row 1.
Note:
Three registers, the LLPx, the CTLx and CFGx, need to be programmed to set up whether single
or multi-block transfers take place, and which type of multi-block transfer is used. The different
transfer types are shown in
The “Update Method” column indicates where the values of SARx, DARx, CTLx, and LLPx are
obtained for the next block transfer when multi-block DMACA transfers are enabled.
Note:
Row 5 in
1. Read the Channel Enable register to choose a free (disabled) channel.
2. Clear any pending interrupts on the channel from the previous DMA transfer by writing
3. Program the following channel registers:
to the Interrupt Clear registers: ClearTfr, ClearBlock, ClearSrcTran, ClearDstTran,
ClearErr. Reading the Interrupt Raw Status and Interrupt Status registers confirms that
all interrupts have been cleared.
The only allowed transitions between the rows of
row 1 or row 5. As already stated, a transition into row 1 or row 5 is used to terminate the DMA
transfer. All other transitions between rows are not allowed. Software must ensure that illegal tran-
sitions between rows do not occur between blocks of a multi-block transfer. For example, if block
N is in row 10 then the only allowed rows for block N + 1 are rows 10, 5 or 1.
In
CFGx.RELOAD_SR, CTLx.LLP_D_EN, and CFGx.RELOAD_DS are illegal, and causes indeter-
minate or erroneous behavior.
Table 19-1 on page 326
Table 19-1 on page 326
Table 19-1 on page
is also a single block transfer.
, all other combinations of LLPx.LOC = 0, CTLx.LLP_S_EN,
326.
Table 19-1 on page 326
are from any row into
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