ATmega32U2 Atmel Corporation, ATmega32U2 Datasheet - Page 195
ATmega32U2
Manufacturer Part Number
ATmega32U2
Description
Manufacturer
Atmel Corporation
Specifications of ATmega32U2
Flash (kbytes)
32 Kbytes
Pin Count
32
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
No
Max I/o Pins
22
Ext Interrupts
20
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
1
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
2
Output Compare Channels
5
Input Capture Channels
1
Pwm Channels
4
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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20.10 Registers Description
20.10.1
20.10.2
7799D–AVR–11/10
USBCON – USB General Control Registers
UPOE – USB Software Output Enable register
Resuming the USB interface
• Bit 7 – USBE: USB macro Enable Bit
Writing this bit to one enables the USB controller and the USB data buffers (D+ and D-). Clear-
ing this bit disables the USB controller and buffers. When cleared the USB controller is reset.
• Bit 6 – Res: Reserved
This bit is reserved and should always read as zero.
• Bit 5 – FRZCLK: Freeze USB Clock Bit
Writing this bit to one disables the internal clock for the USB controller, and tehreby freezing it.
Activating this mode reduces power consumption. All the USB flags are kept unchanged. Only
the “Resume detection” is still active in this mode.
Writing this bit to zero unfreezes the USB controller and allows full operation of the USB
interface.
• Bits 4:0 – Res: Reserved
These bits are reserved and should always read as zero.
• Bit 7:6 – UPWE[1:0]: USB Buffers Direct Drive enable configuration
These bits select the mode of operation of the USB buffers according to
ble configurations of these bits allows to enable or disable the USB buffers direct drive by soft-
ware. When direct drive for USB buffers is enable, the UPDRV[1:0] values are output to the
Bit
Read/Write
Initial Value
Bit
(0xFB)
Read/Write
Initial Value
• Be sure to have interrupts enabled (WAKEUPE) to exit sleep mode
• Put the MCU in sleep mode
• Enable PLL
• Wait PLL lock
• Clear USB suspend clock
• Clear Resume information
(0xD8)
USBE
UPWE1
R/W
R/W
7
0
7
0
UPWE0
R/W
R
6
0
-
6
0
FRZLK
UPDRV1
R/W
R/W
5
1
5
0
UPDRV0
R/W
R
4
0
-
4
0
ATmega8U2/16U2/32U2
R
3
0
R
3
0
-
-
R
R
2
0
2
0
-
-
DPI
R
1
0
R
1
0
-
Table
20-2. The possi-
DMI
0
R
0
R
0
0
-
USBCON
UPOE
195
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