ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 426

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ATmega32U4

Manufacturer Part Number
ATmega32U4
Description
Manufacturer
Atmel Corporation
Datasheets

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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ii
ATmega16/32U4
7
8
9
10 I/O-Ports .................................................................................................. 65
11 External Interrupts ................................................................................. 85
12 Timer/Counter0, Timer/Counter1, and Timer/Counter3 Prescalers ... 89
13 8-bit Timer/Counter0 with PWM ............................................................ 91
Power Management and Sleep Modes ................................................. 43
System Control and Reset .................................................................... 49
Interrupts ................................................................................................ 61
6.10PLL ........................................................................................................................39
7.1Idle Mode .................................................................................................................44
7.2ADC Noise Reduction Mode ...................................................................................44
7.3Power-down Mode ..................................................................................................44
7.4Power-save Mode ...................................................................................................44
7.5Standby Mode .........................................................................................................45
7.6Extended Standby Mode .........................................................................................45
7.7Power Reduction Register .......................................................................................45
7.8Minimizing Power Consumption ..............................................................................47
8.1Internal Voltage Reference ......................................................................................54
8.2Watchdog Timer ......................................................................................................55
9.1Interrupt Vectors in ATmega16U4/ATmega32U4 ....................................................61
10.1Introduction ............................................................................................................65
10.2Ports as General Digital I/O ...................................................................................66
10.3Alternate Port Functions ........................................................................................70
10.4Register Description for I/O-Ports ..........................................................................82
12.1Internal Clock Source ............................................................................................89
12.2Prescaler Reset .....................................................................................................89
12.3External Clock Source ...........................................................................................89
12.4General Timer/Counter Control Register – GTCCR ..............................................90
13.1Overview ...............................................................................................................91
13.2Timer/Counter Clock Sources ...............................................................................92
13.3Counter Unit ..........................................................................................................92
13.4Output Compare Unit ............................................................................................93
13.5Compare Match Output Unit ..................................................................................95
13.6Modes of Operation ...............................................................................................96
13.7Timer/Counter Timing Diagrams .........................................................................100
7766F–AVR–11/10

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