ATMEGA8U2-AU Atmel, ATMEGA8U2-AU Datasheet - Page 220
ATMEGA8U2-AU
Manufacturer Part Number
ATMEGA8U2-AU
Description
MCU AVR 8K FLASH 16MHZ 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8U2-AU
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
22
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-TQFP, 32-VQFP
Processor Series
ATmega
Core
AVR
Data Bus Width
8 bit
Data Ram Size
512 B
Interface Type
SPI, USART, USB
Maximum Clock Frequency
16 MHz
Number Of Programmable I/os
22
Number Of Timers
2
Operating Supply Voltage
5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, AT90USBKEY, ATEVK525
Minimum Operating Temperature
- 40 C
Operating Temperature Range
- 40 C to + 85 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA8U2-AU
Manufacturer:
Atmel
Quantity:
2 772
Part Number:
ATMEGA8U2-AU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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21.18.16 UEIENX – USB Endpoint Interrupt Enable Register
7799D–AVR–11/10
This flag is set by the USB controller when the current bank contains a new packet. This
RXOUTI flag can generate a “USB endpoint interrupt” if RXOUTE bit is set. Writing this bit to
zero acknowledges the interrupt source (USB clocks must be enabled before). Writing this bit to
one has no effect for an OUT endpoint.
Writing this bit to one kills the last loaded bank. This sequence can be used to cancelled a previ-
ously loaded endpoint. Clearing by software has no effect. See
Abort.
• Bit 1 – STALLEDI: STALLEDI Interrupt Flag
This flag is set by the USB controller when STALL handshake has been sent, or when a CRC
error has been detected for an isochronous OUT endpoint. This STALLEDI flag can generate a
“USB endpoint interrupt” if STALLEDE bit is set. Writing this bit to zero acknowledges the inter-
rupt source (USB clocks must be enabled before). Writing this bit to one has no effect.
• Bit 0 – TXINI: Transmitter Ready Interrupt Flag
This flag is set by the USB controller when the current bank is free and can be filled. This TXINI
flag can generate a “USB endpoint interrupt” if TXINE bit is set. Writing this bit to zero acknowl-
edges the interrupt source (USB clocks must be enabled before). Writing this bit to one has no
effect.
• Bit 7 – FLERRE: Flow Error Interrupt Enable Flag
Writing this bit to one enables interrupt on OVERFI or UNDERFI flags. An overflow or underflow
interrupt will be generated only if the FLERRE bit is set to one, the Global Interrupt Flag in SREG
is written to one, and the OVERFI or UNDERFI flags are set.
• Bit 6 – NAKINE: NAK IN Interrupt Enable Bit
Writing this bit to one enables interrupt on NAKINI flag. A NAK IN interrupt will be generated only
if the NAKINE bit is set to one, the Global Interrupt Flag in SREG is written to one, and the
NAKINI is set.
• Bit 5 – Res: Reserved
This bit is reserved and will always read as zero.
• Bit 4 – NAKOUTE: NAK OUT Interrupt Enable Bit
Writing this bit to one enables interrupt on NAKOUTI flag. A NAKOUT interrupt will be generated
only if the NAKOUTE bit is set to one, the Global Interrupt Flag in SREG is written to one, and
the NAKOUTI is set.
Bit
(0xF0)
Read/Write
Initial Value
• Endpoint IN direction (KILLBK bit)
FLERRE
R/W
7
0
NAKINE
R/W
6
0
R
5
0
-
NAKOUTE
R/W
4
0
RXSTPE
ATmega8U2/16U2/32U2
R/W
3
0
RXOUTE
R/W
2
0
page 206
STALLEDE
R/W
1
0
for more details on the
TXINE
R/W
0
0
UEIENX
220
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