ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 283

• Manufacturer Part Number: ATmega32U4
• Manufacturer: Atmel Corporation

Specifications of ATmega32U4

• Flash (kbytes): 32 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 14
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 26
• Ext Interrupts: 13
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 3.3
• 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: 4
• Output Compare Channels: 12
• Input Capture Channels: 2
• Pwm Channels: 8
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

7766F–AVR–11/10
00b: Control10b: Bulk
01b: Isochronous11b: Interrupt
• 5-1 - Reserved
The value read from these bits is always 0. Do not set these bits.
• 0 - EPDIR - Endpoint Direction Bit
Set to configure an IN direction for bulk, interrupt or isochronous endpoints.
Clear to configure an OUT direction for bulk, interrupt, isochronous or control endpoints.
• 7 - Reserved
The value read from these bits is always 0. Do not set these bits.
• 6-4 - EPSIZE2:0 - Endpoint Size Bits
Set this bit according to the endpoint size:
000b: 8 bytes100b: 128 bytes
001b: 16 bytes101b: 256 bytes
010b: 32 bytes110b: 512 bytes
011b: 64 bytes111b: Reserved. Do not use this configuration.
• 3-2 - EPBK1:0 - Endpoint Bank Bits
Set this field according to the endpoint size:
00b: One bank
01b: Double bank
1xb: Reserved. Do not use this configuration.
• 1 - ALLOC - Endpoint Allocation Bit
Set this bit to allocate the endpoint memory.
Clear to free the endpoint memory.
See Section 22.6, page 267 for more details.
• 0 - Reserved
The value read from these bits is always 0. Do not set these bits.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
CFGOK
R
7
0
R
7
0
-
OVERFI
R/W
R/W
6
0
6
0
EPSIZE2:0
UNDERFI
R/W
R/W
5
0
5
0
R/W
R/W
4
0
4
0
-
R/W
3
0
R
3
0
EPBK1:0
DTSEQ1:0
R/W
ATmega16/32U4
2
0
R
2
0
ALLOC
R/W
NBUSYBK1:0
1
0
R
1
0
R
R
0
0
0
0
-
UECFG1X
UESTA0X
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