ATmega32U2 Atmel Corporation, ATmega32U2 Datasheet - Page 216

• Manufacturer Part Number: ATmega32U2
• 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

21.18.12 UECFG1X – USB Endpoint Configuration 1 Register
7799D–AVR–11/10
• Bit 7 – Res: Reserved
This bit is reserved and will always read as zero.
• Bit 6:4 – EPSIZE[2:0]: Endpoint Size Bits
These bits configure the endpoint size for the selected endpoint as shown in
Table 21-3.
• Bits 3:2 – EPBK[1:0]: Endpoint Bank Bits
These bits configure the number of banks that is allocated to the selected endpoint as shown in
Table
Table 21-4.
• Bit 1 – ALLOC: Endpoint Allocation Bit
Writing this to one allows to allocate the specified amount of memory (endpoint size x number of
banks) for the selected endpoint. Writing this bit to zero allows to free the previously allocated
memory for the selected endpoint.
See Section 21.6, page 198 for more details.
• Bit 0 – Res: Reserved
This bit is reserved and will always read as zero.
Bit
(0xED)
Read/Write
Initial Value
EPSIZE2
21-3.
EPBK1
0
0
0
0
1
1
1
1
0
0
1
1
R
7
0
EPSIZE[2:0] Bits Settings
-
EPBK[1:0] Bits Settings
R/W
6
0
EPSIZE1
0
0
1
1
0
0
1
1
EPSIZE[2:0]
R/W
5
0
EPBK0
0
1
0
1
R/W
4
0
EPSIZE0
0
1
0
1
0
1
0
1
R/W
Endpoint Size
One Bank
Two Banks
Reserved
ATmega8U2/16U2/32U2
3
0
EPBK1:0
Endpoint Size
8 Bytes
16 Bytes
32 Bytes
64 Bytes
Reserved.
R/W
2
0
ALLOC
R/W
1
0
Table
R
0
0
-
21-3.
UECFG1X
216