ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 258

• Manufacturer Part Number: ATmega32U4
• Manufacturer: Atmel Corporation

Specifications of ATmega32U4

• Flash (kbytes): 32 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 14
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 26
• Ext Interrupts: 13
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 3.3
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 12
• Input Capture Channels: 2
• Pwm Channels: 8
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

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
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