ATmega16U4 Atmel Corporation, ATmega16U4 Datasheet - Page 288

• Manufacturer Part Number: ATmega16U4
• 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

7766F–AVR–11/10
• 7-3 - Reserved
The value read from these bits is always 0. Do not set these bits.
• 2-0 - BYCT10:8 - Byte count (high) Bits
Set by hardware. This field is the MSB of the byte count of the FIFO endpoint. The LSB part is
provided by the UEBCLX register.
• 7-0 - BYCT7:0 - Byte Count (low) Bits
Set by the hardware. BYCT10:0 is:
- (for IN endpoint) increased after each writing into the endpoint and decremented after each
byte sent,
- (for OUT endpoint) increased after each byte sent by the host, and decremented after each
byte read by the software.
• 7 - Reserved
The value read from these bits is always 0. Do not set these bits.
• 6-0 - EPINT6:0 - Endpoint Interrupts Bits
Set by hardware when an interrupt is triggered by the UEINTX register and if the corresponding
endpoint interrupt enable bit is set.
Cleared by hardware when the interrupt source is served.
Bit
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Read/Write
-
BYCT D7
R
7
0
R
-
R
7
0
7
0
EPINT D6
-
BYCT D6
R
R
6
0
6
0
R
6
0
-
EPINT D5
BYCT D5
R
5
0
R
5
0
R
5
0
-
EPINT D4
BYCT D4
R
4
0
R
4
0
R
4
0
-
EPINT D3
BYCT D3
R
3
0
R
3
0
R
3
0
BYCT D10 BYCT D9
EPINT D2
BYCT D2
R
2
0
ATmega16/32U4
R
2
0
R
2
0
EPINT D1
BYCT D1
1
R
0
R
R
1
0
1
0
BYCT D8
EPINT D0 UEINT
BYCT D0 UEBCLX
R
0
0
R
R
0
0
0
0
UEBCHX
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