ATmega32U2 Atmel Corporation, ATmega32U2 Datasheet - Page 211
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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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21.18.3
7799D–AVR–11/10
UDIEN – USB Device Interrupt Enable Register
• Bit 4 – WAKEUPI: Wake-up CPU Interrupt Flag
This flag is set by hardware when the USB controller detects a non-idle signal from the USB
lines. This WAKEUPI flag can generate a “USB general interrupt” if WAKEUPE bit is set. Writing
this bit to zero acknowledges the interrupt source. Writing this bit to one has no effect.Shall be
cleared by software. Setting by software has no effect.
See
• Bit 3 – EORSTI: End Of Reset Interrupt Flag
This flag is set by hardware when the USB controller detects an “End Of Reset” event on the
USB lines. has been detected by the USB controller. This EORSTI flag can generate a “USB
general interrupt” if EORSTE 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.
Shall be cleared by software. Setting by software has no effect.
• Bit 2 – SOFI: Start Of Frame Interrupt Flag
This flag is set by hardware when the USB controller detects a Start Of Frame PID (SOF) on the
USB lines. This SOFI flag can generate a “USB general interrupt” if SOFE 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.
• Bit 1 – Res: Reserved
This bit is reserved and will always read as zero.
• Bit 0 – SUSPI: Suspend Interrupt Flag
This flag is set by hardware when the USB controller detects a suspend state on the bus (idle
state for more than 3ms). This SUSPI flag can generate a USB general interrupt if SUSPE 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.
See
The interrupt flag bits are set even if their corresponding ‘Enable’ bits is not set.
• Bit 7 – Res: Reserved
This bit is reserved and will always read as zero.
• Bit 6 – UPRSME: Upstream Resume Interrupt Enable Bit
Writing this bit to one enables interrupt on UPRSMI flag. An Upstream resume interrupt will be
generated only if the UPRSME bit is set to one, the Global Interrupt Flag in SREG is written to
one and the UPRSMI bit is set.
Bit
(0xE2)
Read/Write
Initial Value
“Suspend, Wake-up and Resume” on page 200
“Suspend, Wake-up and Resume” on page 200
R
7
0
-
UPRSME
R/W
6
0
EORSME
R/W
5
0
WAKEUPE
R/W
4
0
EORSTE
ATmega8U2/16U2/32U2
R/W
for more details.
for more details.
3
0
SOFE
R/W
2
0
R
1
0
-
SUSPE
R/W
0
0
UDIEN
211
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