ATmega16U4 Atmel Corporation, ATmega16U4 Datasheet - Page 430
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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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ATmega16/32U4
25 JTAG Interface and On-chip Debug System ..................................... 314
26 IEEE 1149.1 (JTAG) Boundary-scan ................................................... 320
27 Boot Loader Support – Read-While-Write Self-Programming ......... 330
28 Memory Programming ......................................................................... 346
24.8ADC Conversion Result ......................................................................................305
24.9ADC Register Description ...................................................................................307
25.1Overview .............................................................................................................314
25.2Test Access Port – TAP ......................................................................................314
25.3TAP Controller .....................................................................................................316
25.4Using the Boundary-scan Chain ..........................................................................317
25.5Using the On-chip Debug System .......................................................................317
25.6On-chip Debug Specific JTAG Instructions .........................................................318
25.7On-chip Debug Related Register in I/O Memory .................................................319
25.8Using the JTAG Programming Capabilities .........................................................319
25.9Bibliography .........................................................................................................319
26.1Features ..............................................................................................................320
26.2System Overview ................................................................................................320
26.3Data Registers .....................................................................................................320
26.4Boundary-scan Specific JTAG Instructions .........................................................322
26.5Boundary-scan Related Register in I/O Memory .................................................323
26.6Boundary-scan Chain ..........................................................................................324
26.7ATmega16U4/ATmega32U4 Boundary-scan Order ............................................327
26.8Boundary-scan Description Language Files ........................................................329
27.1Boot Loader Features ..........................................................................................330
27.2Application and Boot Loader Flash Sections .......................................................330
27.3Read-While-Write and No Read-While-Write Flash Sections ..............................330
27.4Boot Loader Lock Bits .........................................................................................333
27.5Entering the Boot Loader Program ......................................................................334
27.6Addressing the Flash During Self-Programming .................................................337
27.7Self-Programming the Flash ................................................................................338
28.1Program And Data Memory Lock Bits .................................................................346
28.2Fuse Bits .............................................................................................................347
28.3Signature Bytes ...................................................................................................349
28.4Calibration Byte ...................................................................................................349
28.5Parallel Programming Parameters, Pin Mapping, and Commands .....................349
7766F–AVR–11/10
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