AT32UC3A3128S Atmel Corporation, AT32UC3A3128S Datasheet - Page 323
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AT32UC3A3128S
Manufacturer Part Number
AT32UC3A3128S
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 AT32UC3A3128S
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
AES
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
- AT32UC3A0128 PDF datasheet
- AT32UC3A0128 PDF datasheet #2
- AT32UC3A0128 PDF datasheet #3
- AT32UC3A3128 PDF datasheet #4
- AT32UC3A3128 PDF datasheet #5
- Current page: 323 of 1012
- Download datasheet (16Mb)
19.8.1
19.8.1.1
19.8.1.2
19.8.2
32072G–11/2011
Software Handshaking
Hardware Handshaking
Burst Transactions
Single Transactions
Software selects between the hardware or software handshaking interface on a per-channel
basis. Software handshaking is accomplished through memory-mapped registers, while hard-
ware handshaking is accomplished using a dedicated handshaking interface.
When the slave peripheral requires the DMACA to perform a DMA transaction, it communicates
this request by sending an interrupt to the CPU or interrupt controller.
The interrupt service routine then uses the software registers to initiate and control a DMA trans-
action. These software registers are used to implement the software handshaking interface.
The HS_SEL_SRC/HS_SEL_DST bit in the CFGx channel configuration register must be set to
enable software handshaking.
When the peripheral is not the flow controller, then the last transaction registers LstSrcReg and
LstDstReg are not used, and the values in these registers are ignored.
Writing a 1 to the ReqSrcReg[x]/ReqDstReg[x] register is always interpreted as a burst transac-
tion request, where x is the channel number. However, in order for a burst transaction request to
start, software must write a 1 to the SglReqSrcReg[x]/SglReqDstReg[x] register.
You can write a 1 to the SglReqSrcReg[x]/SglReqDstReg[x] and ReqSrcReg[x]/ReqDstReg[x]
registers in any order, but both registers must be asserted in order to initiate a burst transaction.
Upon completion of the burst transaction, the hardware clears the SglReqSrcReg[x]/SglReqD-
stReg[x] and ReqSrcReg[x]/ReqDstReg[x] registers.
Writing a 1 to the SglReqSrcReg/SglReqDstReg initiates a single transaction. Upon completion
of the single transaction, both the SglReqSrcReg/SglReqDstReg and ReqSrcReg/ReqDstReg
bits are cleared by hardware. Therefore, writing a 1 to the ReqSrcReg/ReqDstReg is ignored
while a single transaction has been initiated, and the requested burst transaction is not serviced.
Again, writing a 1 to the ReqSrcReg/ReqDstReg register is always a burst transaction request.
However, in order for a burst transaction request to start, the corresponding channel bit in the
SglReqSrcReg/SglReqDstReg must be asserted. Therefore, to ensure that a burst transaction is
serviced, you must write a 1 to the ReqSrcReg/ReqDstReg before writing a 1 to the SglReqSr-
cReg/SglReqDstReg register.
Software can poll the relevant channel bit in the SglReqSrcReg/ SglReqDstReg and ReqSr-
cReg/ReqDstReg registers. When both are 0, then either the requested burst or single
transaction has completed. Alternatively, the IntSrcTran or IntDstTran interrupts can be enabled
and unmasked in order to generate an interrupt when the requested source or destination trans-
action has completed.
Note:
There are
the module configuration chapter for the device-specific mapping of these interfaces.
The transaction-complete interrupts are triggered when both single and burst transactions are
complete. The same transaction-complete interrupt is used for both single and burst transactions.
8
hardware handshaking interfaces between the DMACA and peripherals. Refer to
323
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