ATmega16U4 Atmel Corporation, ATmega16U4 Datasheet - Page 350
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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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7766F–AVR–11/10
Figure 28-1. Parallel Programming
Note:
Table 28-6.
Table 28-7.
BS2
0
0
1
1
Programming Mode
Signal Name in
RDY/BSY
PAGEL
1. Unused Pins should be left floating.
DATA
BS1
XA0
XA1
BS2
WR
BS1
0
1
0
1
OE
Pin Name Mapping
BS2 and BS1 Encoding
Flash /
EEPROM
Address
Low Byte
High Byte
Extended High
Byte
Reserved
Pin Name
RDY/BSY
PB7-0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
PE6
PAGEL
+12 V
BS2
BS1
XA0
XA1
WR
OE
Flash Data
Loading /
Reading
Low Byte
High Byte
Reserved
Reserved
I/O
I/O
(1)
O
I
I
I
I
I
I
I
PD1
PD2
PD3
PD4
PD5
PD6
PD7
RESET
XTAL1
GND
PE6
Function
0: Device is busy programming, 1: Device is
ready for new command.
Output Enable (Active low).
Write Pulse (Active low).
Byte Select 1.
XTAL Action Bit 0
XTAL Action Bit 1
Program Memory and EEPROM data Page Load.
Byte Select 2.
Bi-directional Data bus (Output when OE is low).
PB7 - PB0
Fuse
Programming
Low Byte
High Byte
Extended Byte
Reserved
AVCC
VCC
+5V
+5V
ATmega16/32U4
DATA
Reading Fuse
and Lock Bits
Fuse Low Byte
Lock bits
Extended Fuse
Byte
Fuse High Byte
350
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