ATmega32U2 Atmel Corporation, ATmega32U2 Datasheet - Page 196
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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20.10.3
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
196
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