ATUC128L4U Atmel Corporation, ATUC128L4U Datasheet - Page 92
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ATUC128L4U
Manufacturer Part Number
ATUC128L4U
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT32UC3A0128.pdf
(377 pages)
2.AT32UC3A0128.pdf
(159 pages)
3.ATUC128L4U.pdf
(960 pages)
4.ATUC128L4U.pdf
(92 pages)
Specifications of ATUC128L4U
Flash (kbytes)
128 Kbytes
Pin Count
48
Max. Operating Frequency
50 MHz
Cpu
32-bit AVR
# Of Touch Channels
17
Hardware Qtouch Acquisition
Yes
Max I/o Pins
36
Ext Interrupts
36
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
1
Twi (i2c)
2
Uart
4
Lin
4
Ssc
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
12
Adc Speed (ksps)
460
Analog Comparators
8
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
16
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.62 to 3.6
Operating Voltage (vcc)
1.62 to 3.6
Fpu
No
Mpu / Mmu
Yes / No
Timers
6
Output Compare Channels
18
Input Capture Channels
12
Pwm Channels
35
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATUC128L4U-U
Manufacturer:
ATMEL
Quantity:
3 006
- AT32UC3A0128 PDF datasheet
- AT32UC3A0128 PDF datasheet #2
- ATUC128L4U PDF datasheet #3
- ATUC128L4U PDF datasheet #4
- Current page: 92 of 960
- Download datasheet (15Mb)
8.6.2.11
32142A–12/2011
STALL request
• Special considerations for control endpoints
• STALL handshake and retry mechanism
Table 8-4.
For each endpoint, the STALL management is performed using:
To answer requests with a STALL handshake, STALLRQ has to be set by writing a one to the
STALL Request Set (STALLRQS) bit. All following requests will be discarded (RXOUTI, etc. will
not be set) and handshaked with a STALL until the STALLRQ bit is cleared, by receiving a new
SETUP packet (for control endpoints) or by writing a one to the STALL Request Clear (STALL-
RQC) bit.
Each time a STALL handshake is sent, the STALLEDI bit is set by the USBC and the EPnINT
interrupt is set.
The user can use the descriptor to manage STALL requests. The USBC controller reads the
EPn_CTR_STA_BK0/1.STALLRQ_NEXT bit after successful transactions and if it is one the
USBC controller will set UECON.STALLRQ. The STALL_NEXT bit will be cleared upon receiving
a SETUP transaction and the USBC controller will then clear the STALLRQ bit.
If a SETUP packet is received at a control endpoint where a STALL request is active, the
Received SETUP Interrupt (RXSTPI) bit in UESTAn is set, and the STALLRQ and STALLEDI
bits are cleared. It allows the SETUP to be always ACKed as required by the USB standard.
This management simplifies the enumeration process management. If a command is not sup-
ported or contains an error, the user requests a STALL and can return to the main task, waiting
for the next SETUP request.
The retry mechanism has priority over the STALL handshake. A STALL handshake is sent if the
STALLRQ bit is set and if there is no retry required.
• The control and status fields for the endpoint and bank (EPn_CTR_STA_BK0/1):
• The STALL Request (STALLRQ) bit in UECONn is set to initiate a STALL request.
• The STALLed Interrupt (STALLEDI) bit in UESTAn is set when a STALL handshake has been
31:19
sent.
-
– UNDERF: Underflow status for isochronous IN transfer. See
– OVERF: Overflow status for isochronous OUT transfer. See
– CRCERR: CRC error status for isochronous OUT transfer. See
– STALLRQ_NEXT: Stall request for the next transfer. See
page
page
99.
92.
18
UNDERF
99.
99.
EPn_CTR_STA_BK0/1 structure
Status elements
17
OVERF
16
CRCERR
15:1
-
ATUC64/128/256L3/4U
Control elements
”STALL request” on page
”Data flow error” on
”Data flow error” on
”CRC error” on page
0
STALLRQ_NEXT
92
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