ATmega16U2 Atmel Corporation, ATmega16U2 Datasheet - Page 195

• Manufacturer Part Number: ATmega16U2
• Manufacturer: Atmel Corporation

Specifications of ATmega16U2

• Flash (kbytes): 16 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: 21
• 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): 0.5
• 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: 2
• Output Compare Channels: 5
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

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
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