ATMEGA32U4-AUR Atmel, ATMEGA32U4-AUR Datasheet - Page 35

MCU AVR 16K FLASH 16MHZ 44TQFP

ATMEGA32U4-AUR

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

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

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA32U4-AUR
Manufacturer:
Atmel
Quantity:
10 000
6.8
6.8.1
7766F–AVR–11/10
USB
CPU Clock
External
Oscillator
RC oscillator
USB
CPU Clock
External
Oscillator
RC oscillator
Clock switch Algorithm
Switch from external clock to RC clock
non-Idle
non-Idle
Figure 6-4.
Figure 6-5.
if (Usb_suspend_detected())
{
}
Ext
Ext
Usb_ack_suspend();
Usb_freeze_clock();
Disable_pll();
Enable_RC_clock();
while (!RC_clock_ready());
Select_RC_clock();
Disable_external_clock();
3m
3m
Idle
Idle
s
s
Example of clock switching with wake-up from USB Host
Example of clock switching with wake-up from Device
w atchdog wake-up
from power-down
w atchdog wake-up
from power-down
(Suspend)
(Suspend)
2 Upstream Resume from device
1 Resume from Host
RC
RC
// if (UDINT.SUSPI == 1)
// UDINT.SUSPI = 0;
// USBCON.FRZCLK = 1;
// PLLCSR.PLLE = 0;
// CLKSEL0.RCE = 1;
// while (CLKSTA.RCON != 1);
// CLKSEL0.CLKS = 0;
// CLKSEL0.EXTE = 0;
ATmega16/32U4
upstream-resume
1
resume
2
non-Idle
non-Idle
Ext
Ext
35

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