ATMEGA32U4-AUR Atmel, ATMEGA32U4-AUR Datasheet - Page 283

• Manufacturer Part Number: ATMEGA32U4-AUR
• Description: MCU AVR 16K FLASH 16MHZ 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA32U4-AUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 26
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2.5K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
283