ATMEGA32U4-AUR Atmel, ATMEGA32U4-AUR Datasheet - Page 420

• Manufacturer Part Number: ATMEGA32U4-AUR
• Description: MCU AVR 16K FLASH 16MHZ 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA32U4-AUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 26
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2.5K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

35.3
35.4
7766F–AVR–11/10
ATmega16U4/ATmega32U4 Rev C
ATmega16U4/ATmega32U4 Rev B
3.
Not sampled
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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