ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 12

• Manufacturer Part Number: ATmega32U4
• 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

4.7.4
4.8
4.8.1
4.8.2
12
Reading Configuration Information or Manufacturer Information
Answers from the Device to a Blank Check Command
Requests From Host
Answers from Bootloader
The Host controller sends a GET_STATUS request to the device. Once internal blank check has
been completed, the device sends its status.
The flow described hereafter allows the user to read the configuration or manufacturer
information.
To start the programming operation, the Host sends DFU_DNLOAD request with the Read com-
mand in the data field (2 bytes).
The device has two possible answers to a DFU_GETSTATUS request:
Command Identifier
• If the device status is “OK”:
• If the device status is “errCHECK_ERASED”:
• If the chip is protected from program access, an “err_VENDOR” status is returned to the
• Otherwise, the device status is “OK“. The Host can send a DFU_UPLOAD request to the
Id_read_command
the device memory is then blank and the device waits for the next Host request.
the device memory is not blank. The device waits for an DFU_UPLOAD request to send the
first address where the byte is not 0xFF.
Host.
device in order to get the value of the requested field.
05h
data[0]
SETUP
OUT
IN
00h
01h
data[1]
00h
01h
02h
30h
31h
60h
61h
data[2]
Read_command (2 bytes)
DFU_DNLOAD
ZLP
data[3]
data[4]
Read Bootloader Version
Read Device boot ID1
Read Device boot ID2
Read Manufacturer Code
Read Family Code
Read Product Name
Read Product Revision
Description
7618C–AVR–07/08