ATMEGA16U2-MU Atmel, ATMEGA16U2-MU Datasheet - Page 193

• Manufacturer Part Number: ATMEGA16U2-MU
• Description: MCU AVR 16K FLASH USB 32-VQFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA16U2-MU

• 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: 16KB (8K 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-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Core: AVR8
• Processor Series: ATMEGA16x
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 16 MHz
• Data Ram Size: 1.25 KB
• Data Rom Size: 512 B
• Number Of Programmable I/os: 22
• Number Of Timers: 2
• Mounting Style: SMD/SMT
• Height: 0.95 mm
• Interface Type: SPI, UART
• Length: 5 mm
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Width: 5 mm
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -
• Lead Free Status / Rohs Status: Details

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
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