ATMEGA32U4-MUR Atmel, ATMEGA32U4-MUR Datasheet - Page 270

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ATMEGA32U4-MUR

Manufacturer Part Number
ATMEGA32U4-MUR
Description
MCU AVR 16K FLASH 16MHZ 44VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet

Specifications of ATMEGA32U4-MUR

Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
26
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2.5K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-VQFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA32U4-MUR
Manufacturer:
UCC
Quantity:
1 001
22.10 Remote Wake-up
22.11 STALL request
22.11.1
7766F–AVR–11/10
Special consideration for Control Endpoints
The “Remote Wake-up” (or “upstream resume”) feature is the only operation allowed to be sent
by the device on its own initiative. Anyway, to do that, the device should first have received a
DEVICE_REMOTE_WAKEUP request from the host.
For each endpoint, the STALL management is performed using 2 bits:
To send a STALL handshake at the next request, the STALLRQ request bit has to be set. All fol-
lowing requests will be handshak’ed with a STALL until the STALLRQC bit is set.
Setting STALLRQC automatically clears the STALLRQ bit. The STALLRQC bit is also immedi-
ately cleared by hardware after being set by software. Thus, the firmware will never read this bit
as set.
Each time the STALL handshake is sent, the STALLEDI flag is set by the USB controller and the
EPINTx interrupt will be triggered (if enabled).
The incoming packets will be discarded (RXOUTI and RWAL will not be set).
The host will then send a command to reset the STALL: the firmware just has to set the STALL-
RQC bit and to reset the endpoint.
A SETUP request is always ACK’ed.
If a STALL request is set for a Control Endpoint and if a SETUP request occurs, the SETUP
request has to be ACK’ed and the STALLRQ request and STALLEDI sent flags are automati-
cally reset (RXSETUPI set, TXIN cleared, STALLED cleared, TXINI cleared...).
This management simplifies the enumeration process management. If a command is not sup-
ported or contains an error, the firmware set the STALL request flag and can return to the main
task, waiting for the next SETUP request.
This function is compliant with the Chapter 8 test that may send extra status for a
GET_DESCRIPTOR. The firmware sets the STALL request just after receiving the status. All
extra status will be automatically STALL’ed until the next SETUP request.
• First, the USB controller must have detected the “suspend” state of the line: the remote wake-
• The firmware has then the ability to set RMWKUP to send the “upstream resume” stream.
• When the controller starts to send the “upstream resume”, the UPRSMI interrupt is triggered
• RMWKUP is cleared by hardware at the end of the “upstream resume”.
• If the controller detects a good “End Of Resume” signal from the host, an EORSMI interrupt
up can only be sent when a SUSPI flag is set.
This will automatically be done by the controller after 5ms of inactivity on the USB line.
(if enabled). SUSPI is cleared by hardware.
is triggered (if enabled).
– STALLRQ (enable stall request)
– STALLRQC (disable stall request)
– STALLEDI (stall sent interrupt)
ATmega16/32U4
270

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