ATmega16U4 Atmel Corporation, ATmega16U4 Datasheet - Page 277
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ATmega16U4
Manufacturer Part Number
ATmega16U4
Description
Manufacturer
Atmel Corporation
Specifications of ATmega16U4
Flash (kbytes)
16 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)
2.1
Eeprom (bytes)
512
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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22.18 Registers
22.18.1
7766F–AVR–11/10
USB device general registers
Figure 22-5. USB Device Controller Endpoint Interrupt System
Processing interrupts are generated when:
Exception Interrupts are generated when:
• Ready to accept IN data(EPINTx, TXINI=1)
• Received OUT data(EPINTx, RXOUTI=1)
• Received SETUP(EPINTx, RXSTPI=1)
• Stalled packet(EPINTx, STALLEDI=1)
• CRC error on OUT in isochronous mode(EPINTx, STALLEDI=1)
• Overflow in isochronous mode(EPINTx, OVERFI=1)
• Underflow in isochronous mode(EPINTx, UNDERFI=1)
• NAK IN sent(EPINTx, NAKINI=1)
• NAK OUT sent(EPINTx, NAKOUTI=1)
UESTAX.6
UESTAX.5
UNDERFI
UEINTX.6
NAKOUTI
UEINTX.4
UEINTX.3
UEINTX.2
UEINTX.1
UEINTX.0
OVERFI
RXOUTI
STALLEDI
RXSTPI
NAKINI
Bit
Read/Write
Initial Value
TXINI
UEIENX.7
UEIENX.6
UEIENX.4
UEIENX.3
UEIENX.2
UEIENX.1
UEIENX.0
RXOUTE
STALLEDE
FLERRE
TXSTPE
TXOUTE
R
NAKINE
7
0
-
TXINE
R
6
0
-
R
5
0
-
UEINT.X
Endpoint 0
EPINT
R
4
0
-
Endpoint 1
Endpoint 2
RSTCPU
Endpoint 3
R
3
0
Endpoint 4
Endpoint 5
Endpoint 6
LSM
R/W
ATmega16/32U4
2
0
RMWKUP
R/W
1
0
DETACH
R/W
0
1
Endpoint Interrupt
UDCON
277
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