ATmega32U2 Atmel Corporation, ATmega32U2 Datasheet - Page 305

• Manufacturer Part Number: ATmega32U2
• Manufacturer: Atmel Corporation

Specifications of ATmega32U2

• Flash (kbytes): 32 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 22
• Ext Interrupts: 20
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 2
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 1
• 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: 2
• Output Compare Channels: 5
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

iv
ATmega8U2/16U2/32U2
19 USART in SPI Mode ............................................................................. 176
20 USB Controller ..................................................................................... 185
21 USB Device Operating modes ............................................................ 197
18.2Overview .............................................................................................................148
18.3Clock Generation .................................................................................................149
18.4Frame Formats ....................................................................................................152
18.5USART Initialization ............................................................................................154
18.6Data Transmission – The USART Transmitter ....................................................155
18.7Data Reception – The USART Receiver .............................................................157
18.8Asynchronous Data Reception ............................................................................161
18.9Multi-processor Communication Mode ................................................................164
18.10Hardware Flow Control ......................................................................................165
18.11Register Description ..........................................................................................167
18.12Examples of Baud Rate Setting ........................................................................171
19.1Features ..............................................................................................................176
19.2Overview .............................................................................................................176
19.3Clock Generation .................................................................................................176
19.4SPI Data Modes and Timing ...............................................................................177
19.5Frame Formats ....................................................................................................178
19.6Data Transfer ......................................................................................................179
19.7Register Description ............................................................................................181
19.8AVR USART MSPIM vs. AVR SPI ......................................................................183
20.1Features ..............................................................................................................185
20.2Overview .............................................................................................................185
20.3USB Module Powering Options ...........................................................................186
20.4General Operating Modes ...................................................................................189
20.5Power modes ......................................................................................................191
20.6Memory management .........................................................................................192
20.7PAD suspend ......................................................................................................193
20.8D+/D- Read/write .................................................................................................194
20.9USB Software Operating modes .........................................................................194
20.10Registers Description ........................................................................................195
21.1Overview .............................................................................................................197
21.2Power-on and reset .............................................................................................197
21.3Endpoint reset .....................................................................................................197
7799D–AVR–11/10