ATMEGA8U2-AU Atmel, ATMEGA8U2-AU Datasheet - Page 193
![MCU AVR 8K FLASH 16MHZ 32TQFP](/photos/6/91/69154/313-32-tqfp_sml.jpg)
ATMEGA8U2-AU
Manufacturer Part Number
ATMEGA8U2-AU
Description
MCU AVR 8K FLASH 16MHZ 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8U2-AU
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
22
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-TQFP, 32-VQFP
Processor Series
ATmega
Core
AVR
Data Bus Width
8 bit
Data Ram Size
512 B
Interface Type
SPI, USART, USB
Maximum Clock Frequency
16 MHz
Number Of Programmable I/os
22
Number Of Timers
2
Operating Supply Voltage
5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, AT90USBKEY, ATEVK525
Minimum Operating Temperature
- 40 C
Operating Temperature Range
- 40 C to + 85 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA8U2-AU
Manufacturer:
Atmel
Quantity:
2 772
Part Number:
ATMEGA8U2-AU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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- Download datasheet (6Mb)
20.7
7799D–AVR–11/10
PAD suspend
Note that:
The next figures illustrates the pad behaviour:
Figure 20-11. Pad behaviour
The SUSPI flag indicated that a suspend state has been detected on the USB bus. This flag
automatically put the USB pad in Idle. The detection of a non-idle event sets the WAKEUPI flag
and wakes-up the USB pad.
• Endpoints activation:
• Endpoint disable:
• Free its memory:
• Endpoint activation:
• The data of Endpoint 0 is never lost at activation or deactivation of a higher Endpoint. The
• Deactivate and reactivate the same Endpoint with the same parameters does not lead to a
• CFGOK is set by hardware even in the case that there is a “conflict” in the memory allocation.
• In the Idle mode, the pad is put in low power consumption mode.
• In the Active mode, the pad is working.
Endpoint 0 to Endpoint 4 are configured, in the growing order. The memory of each is
reserved in the DPRAM.
The Endpoint 2 is disabled (EPEN=0), but its memory reservation is internally kept by the
controller.
The ALLOC bit is cleared: the Endpoint 3 slides down, but the Endpoint 4 does not slide.
The firmware chooses to reconfigure the Endpoint 2, but with a bigger size. The controller
reserved the memory after the endpoint 1 memory and automatically slide the Endpoint 3.
The Endpoint 4 does not move and a memory conflict appear, in that both Endpoint 3 and 4
use a common area. The data of those endpoints are potentially lost.
data is lost only if the Endpoint 0 is deactivated.
slide of the higher endpoints. For those endpoints, the data are preserved.
Idle mode
| DETACH=1
| suspend
USBE=0
& DETACH=0
& suspend
ATmega8U2/16U2/32U2
USBE=1
Active mode
193
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