ATmega16U4 Atmel Corporation, ATmega16U4 Datasheet - Page 420
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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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35.3
35.4
7766F–AVR–11/10
ATmega16U4/ATmega32U4 Rev C
ATmega16U4/ATmega32U4 Rev B
3.
Not sampled
•
•
•
•
1. Spike on TWI pins when TWI is enabled
2. High current consumption in sleep mode
3. Incorrect execution of VBUSTI interrupt
4.
Spike on TWI pins when TWI is enabled
High current consumption in sleep mode
Incorrect execution of VBUSTI interrupt
Timer 4 11-bits enhanced PWM mode
T
Timer 4 11-bits enhanced mode is not functional.
Problem Fix/work around
None.
100 ns negative spike occurs on SDA and SCL pins when TWI is enabled.
Problem Fix/work around
Enable ATmega16U4/ATmega32U4 TWI before the other nodes of the TWI network.
If a pending interrupt cannot wake the part up from the selected mode, the current consump-
tion will increase during sleep when executing the SLEEP instruction directly after a SEI
instruction.
Problem Fix/work around
Before entering sleep, interrupts not used to wake up the part from the sleep mode should
be disabled.
The CPU may incorrectly execute the interrupt vector related to the VBUSTI interrupt flag.
Problem fix/work around
Do not enable this interrupt. Firmware must process this USB event by polling VBUSTI.
T
Timer 4 11-bits enhanced mode is not functional.
Problem Fix/work around
None.
imer 4 11-bits enhanced PWM mode
imer 4 11-bits enhanced PWM mode
ATmega16/32U4
420
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