ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 280
ATmega32U4
Manufacturer Part Number
ATmega32U4
Description
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
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7766F–AVR–11/10
• 3 - EORSTE - End Of Reset Interrupt Enable Bit
Set to enable the EORSTI interrupt. This bit is set after a reset.
Clear to disable the EORSTI interrupt.
• 2 - SOFE - Start Of Frame Interrupt Enable Bit
Set to enable the SOFI interrupt.
Clear to disable the SOFI interrupt.
• 1 - Reserved
The value read from this bits is always 0. Do not set this bit
• 0 - SUSPE - Suspend Interrupt Enable Bit
Set to enable the SUSPI interrupt.
Clear to disable the SUSPI interrupt.
• 7 - ADDEN - Address Enable Bit
Set to activate the UADD (USB address).
Cleared by hardware. Clearing by software has no effect.
See Section 22.7, page 268 for more details.
• 6-0 - UADD6:0 - USB Address Bits
Load by software to configure the device address.
• 7-3 - Reserved
The value read from these bits is always 0. Do not set these bits.
• 2-0 - FNUM10:8 - Frame Number Upper Value
Set by hardware. These bits are the 3 MSB of the 11-bits Frame Number information. They are
provided in the last received SOF packet. FNUM is updated if a corrupted SOF is received.
Bit
Read/Write
Initial Val-
ue
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
ADDEN
W
7
0
R
R
7
0
7
0
-
R/W
6
0
R
6
0
R
-
6
0
R/W
R
5
0
-
R
5
0
5
0
R/W
R
4
0
-
R
4
0
4
0
FNUM7:0
UADD6:0
R/W
R
3
0
-
R
3
0
3
0
R/W
R
2
0
R
2
0
ATmega16/32U4
2
0
FNUM10:8
R/W
R
1
0
R
1
0
1
0
R/W
R
0
0
R
0
0
0
0
UDFNUMH
UDFNUML
UDADDR
280
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