ATMEGA16U4-AU Atmel, ATMEGA16U4-AU Datasheet - Page 258

• Manufacturer Part Number: ATMEGA16U4-AU
• Description: MCU AVR 16K FLASH USB 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA16U4-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 26
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1.25K 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-TQFP, 44-VQFP
• Processor Series: ATMEGA16x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 1.25 KB
• Interface Type: SPI, TWI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 26
• Number Of Timers: 5
• 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
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 12 Channel
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32ATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVRATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7766F–AVR–11/10
Figure 21-8. USB Interrupt System
The USB hardware module distinguishes between USB General events and USB Endpoint
events that are relevant with data transfers relative to each endpoint.
Figure 21-9. USB General interrupt vector sources
Almost all these interrupts are time-relative events that will be detected only if the USB clock is
enabled (FRZCLK bit set), except for:
This asynchronous interrupts allow to wake-up a device that is in power-down mode, generally
after that the USB has entered the Suspend state.
• VBUS plug-in detection (insert, remove)
• WAKEUP interrupt that will trigger each time a state change is detected on the data lines.
USBINT.0
UPRSMI
UDINT.6
EORSMI
UDINT.5
UDINT.4
UDINT.3
UDINT.2
UDINT.0
VBUSTI
WAKEUPI
EORSTI
SUSPI
SOFI
Endpoint
Interrupt
USB General
Interrupt
USB Device
Interrupt
USBCON.0
EORSME
UPRSME
WAKEUPE
EORSTE
VBUSTE
UDIEN.6
UDIEN.5
UDIEN.4
UDIEN.3
UDIEN.2
UDIEN.0
SUSPE
SOFE
Interrupt Vector
USB General
USB Device
Interrupt
Asynchronous Interrupt source
(allows the CPU to wake up from power down mode)
USB Endpoint/Pipe
ATmega16/32U4
Interrupt Vector
Interrupt Vector
USB General
Interrupt Vector
USB General
258