ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 428
ATmega32U4
Manufacturer Part Number
ATmega32U4
Description
Manufacturer
Atmel Corporation
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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iv
ATmega16/32U4
19 USART in SPI Mode ............................................................................. 214
20 2-wire Serial Interface .......................................................................... 223
21 USB controller ...................................................................................... 253
18.3Frame Formats ....................................................................................................190
18.4USART Initialization ............................................................................................192
18.5Data Transmission – The USART Transmitter ....................................................193
18.6Data Reception – The USART Receiver .............................................................195
18.7Asynchronous Data Reception ............................................................................199
18.8Multi-processor Communication Mode ................................................................202
18.9Hardware Flow Control ........................................................................................203
18.10USART Register Description .............................................................................205
18.11Examples of Baud Rate Setting ........................................................................209
19.1Overview .............................................................................................................214
19.2Clock Generation .................................................................................................214
19.3SPI Data Modes and Timing ...............................................................................215
19.4Frame Formats ....................................................................................................215
19.5Data Transfer ......................................................................................................217
19.6USART MSPIM Register Description ..................................................................219
19.7AVR USART MSPIM vs. AVR SPI ......................................................................221
20.1Features ..............................................................................................................223
20.22-wire Serial Interface Bus Definition ..................................................................223
20.3Data Transfer and Frame Format ........................................................................224
20.4Multi-master Bus Systems, Arbitration and Synchronization ...............................227
20.5Overview of the TWI Module ...............................................................................228
20.6TWI Register Description ....................................................................................231
20.7Using the TWI ......................................................................................................234
20.8Transmission Modes ...........................................................................................238
20.9Multi-master Systems and Arbitration ..................................................................251
21.1Features ..............................................................................................................253
21.2Block Diagram .....................................................................................................253
21.3Typical Application Implementation .....................................................................254
21.4Crystal-less operation ..........................................................................................256
21.5Design guidelines ................................................................................................256
21.6General Operating Modes ...................................................................................257
21.7Power modes ......................................................................................................259
7766F–AVR–11/10
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