ATmega16U2 Atmel Corporation, ATmega16U2 Datasheet - Page 196

• 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

20.10.3
7799D–AVR–11/10
REGCR – Regulator Control Register
buffers.
Table 20-2.
• Bit 5:4 – UPDRV[1:0]: USB direct drive values
These bits are relevant only when one of the direct drive modes for USB is enable. When
UPWE[1:0] is 1:0 the values of these bits are output to USB.
The value written to UPDRV1 is output to D+.
The value written to UPDRV0 is output to D-.
• Bits 3:2 – Res: Reserved
These bits are reserved and should always read as zero.
• Bit 1 – DPI: D+ Input value
This bit is read only, the value read from this bit reflects the D+ pin (USB buffer). This bit is set
one by hardware if a one logic level is read on D+. This bit is set to zero by hardware if a zero
logic level is read on D+.
• Bit 0 – DMI: D- Input value
This bit is read only, the value read from this bit reflects the D- pin (USB buffer). This bit is set
one by hardware if a logic one is read on D-. This bit is set to zero by hardware if a logic zero
logic is read on D-.
• Bit 0 – REGDIS: Regulator Disable
Writing this bit to a logic one disables the internal 3.3V regulator. Writing this bit to a logic zero
enables the regulstor.
Bit
(0x63)
Read/Write
Initial Value
UPWE1
0
0
1
1
UPWE[I:0] Bits Settings
R
7
0
-
R
6
0
-
UPWE0
R
5
0
-
0
1
0
1
R
4
0
-
Direct drive is disabled.
Reserved
Direct drive of DP/DM (UPDRV[1:0] values)
Reserved
Mode
ATmega8U2/16U2/32U2
R
3
0
-
R
2
0
-
R
1
0
-
REGDIS
R/W
0
0
REGCR
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