ATmega16U4 Atmel Corporation, ATmega16U4 Datasheet - Page 347
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ATmega16U4
Manufacturer Part Number
ATmega16U4
Description
Manufacturer
Atmel Corporation
Specifications of ATmega16U4
Flash (kbytes)
16 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)
2.1
Eeprom (bytes)
512
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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28.2
7766F–AVR–11/10
Fuse Bits
Table 28-2.
Notes:
The ATmega16U4/ATmega32U4 has three bytes.
functionality of all the fuses and how they are mapped into the Fuse bytes. Note that the fuses
are read as logical zero, “0”, if they are programmed.
Table 28-3.
Notes:
BLB1 Mode
Fuse Low Byte
–
–
–
–
HWBE
BODLEVEL2
BODLEVEL1
BODLEVEL0
1
2
3
4
Memory Lock Bits
1. Program the Fuse bits and Boot Lock bits before programming the LB1 and LB2.
2. “1” means unprogrammed, “0” means programmed
1. See
2. “1” means unprogrammed, “0” means programmed
(1)
(1)
(1)
Lock Bit Protection Modes
Extended Fuse Byte
BLB12
Table 8-2 on page 52
1
1
0
0
Bit No
7
6
5
4
3
2
1
0
BLB11
Description
–
–
–
–
Hardware Boot Enable
Brown-out Detector trigger level
Brown-out Detector trigger level
Brown-out Detector trigger level
1
0
0
1
Protection Type
No restrictions for SPM or (E)LPM accessing the Boot Loader
section.
SPM is not allowed to write to the Boot Loader section.
SPM is not allowed to write to the Boot Loader section, and (E)LPM
executing from the Application section is not allowed to read from
the Boot Loader section. If Interrupt Vectors are placed in the
Application section, interrupts are disabled while executing from the
Boot Loader section.
(E)LPM executing from the Application section is not allowed to
read from the Boot Loader section. If Interrupt Vectors are placed in
the Application section, interrupts are disabled while executing from
the Boot Loader section.
(2)
for BODLEVEL Fuse decoding.
(1)(2)
(Continued)
Table 28-3
ATmega16/32U4
0 (programmed)
-
ATmega16/32U4
Table 28-5
1 (unprogrammed)
1 (unprogrammed)
0 (programmed)
Default Value
describe briefly the
1
1
1
1
ATmega16/32U4RC
1 (unprogrammed)
347
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