ATmega16U4 Atmel Corporation, ATmega16U4 Datasheet - Page 18
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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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
8. Bootloader History
9. Appendix-A
18
The following table shows the different bootloader revision and associated changes.
Table 8-1.
Table 9-1.
Id_prog_start
01h
Id_display_data
03h
Id_write_command
04h
Id_read_command
05h
Id_change _base
_address
06h
Command Identifier
AT90USB1287
AT90USB1286
AT90USB647
AT90USB646
AT90USB162
ATmega32U4
ATmega16U4
AT90USB82
Product
USB Bootloader History
Summary of Frames from Host
data[0]
Bootloader Revision
00h
01h
03h
00h
01h
00h
01h
02h
00h
03h
1.0.1
1.0.0
1.0.1
1.0.5
1.0.0
00h
01h
02h
30h
31h
60h
61h
00
data[1]
FFh
00h
01h
start_address
start_address
“PP”
data[2]
address
Allow to use 16MHz cristal with 3.3V power supply and
data[3]
end_address
end_address
Improved USB autobaud process
data[4]
Initial Revision
Initial Revision
Initial Revision
CKDIV8 fuse.
Changes
Init FLASH programming
Init EEPROM programming
Display FLASH Data
Blank Check in FLASH
Display EEPROM Data
Full chip Erase (bits at FFh)
Hardware reset
LJMP address
Read Bootloader Version
Read Device boot ID1
Read Device boot ID2
Read Manufacturer Code
Read Family Code
Read Product Name
Read Product Revision
Select “PP” 64kBytes flash
page number
Description
7618C–AVR–07/08