ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 259
ATmega32U4
Manufacturer Part Number
ATmega32U4
Description
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
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21.7
21.7.1
21.7.2
7766F–AVR–11/10
Power modes
Idle mode
Power down
UESTAX.6
UESTAX.5
UEINTX.6
UEINTX.4
UEINTX.3
UEINTX.2
UEINTX.1
UEINTX.0
UNDERFI
NAKOUTI
STALLEDI
OVERFI
RXOUTI
RXSTPI
NAKINI
TXINI
Figure 21-10. USB Endpoint Interrupt vector sources
Each endpoint has 8 interrupts sources associated with flags, and each source can be enabled
or not to trigger the corresponding endpoint interrupt. If, for an endpoint, at least one of the
sources is enabled to trigger interrupt, the corresponding event(s) will make the program branch
to the USB Endpoint Interrupt vector. The user may determine the source (endpoint) of the inter-
rupt by reading the UEINT register, and then handle the event detected by polling the different
flags.
In this mode, the CPU core is halted (CPU clock stopped). The Idle mode is taken wether the
USB controller is running or not. The CPU “wakes up” on any USB interrupts.
In this mode, the oscillator is stopped and halts all the clocks (CPU and peripherals). The USB
controller “wakes up” when:
• the WAKEUPI interrupt is triggered
• the VBUSTI interrupt is triggered
UEIENX.7
UEIENX.6
UEIENX.4
UEIENX.3
UEIENX.2
UEIENX.1
UEIENX.0
RXOUTE
STALLEDE
RXSTPE
FLERRE
TXSTPE
NAKINE
TXINE
UEINT.X
Endpoint 0
EPINT
Endpoint 1
Endpoint 2
Endpoint 3
Endpoint 4
Endpoint 5
Endpoint 6
ATmega16/32U4
Interrupt Vector
USB Endpoint
259
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