ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 262
ATmega32U4
Manufacturer Part Number
ATmega32U4
Description
Manufacturer
Atmel Corporation
Specifications of ATmega32U4
Flash (kbytes)
32 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)
3.3
Eeprom (bytes)
1024
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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21.11 Plug-in detection
7766F–AVR–11/10
Figure 21-12. Pad behaviour
The SUSPI flag indicated that a suspend state has been detected on the USB bus. This flag
automatically put the USB pad in Idle. The detection of a non-idle event sets the WAKEUPI flag
and wakes-up the USB pad.
Moreover, the pad can also be put in the “idle” mode if the DETACH bit is set. It come back in
the active mode when the DETACH bit is cleared.
The USB connection is detected by the VBUS pad, thanks to the following architecture:
SUSPI
WAKEUPI
PAD status
Active
Suspend detected = USB pad power down
Idle mode
Resume = USB pad wake-up
| DETACH=1
| suspend
USBE=0
Power Down
& DETACH=0
& suspend
USBE=1
Clear Suspend by software
Clear Resume by software
Active mode
Active
ATmega16/32U4
262
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