ATmega406 Atmel Corporation, ATmega406 Datasheet - Page 198

• Manufacturer Part Number: ATmega406
• Manufacturer: Atmel Corporation

Specifications of ATmega406

• Flash (kbytes): 40 Kbytes
• Pin Count: 48
• Max. Operating Frequency: 1 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 18
• Ext Interrupts: 4
• Usb Speed: No
• Usb Interface: No
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 12
• Adc Speed (ksps): 1.9
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -30 to 85
• I/o Supply Class: 4.0 to 25
• Operating Voltage (vcc): 4.0 to 25
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 3
• Pwm Channels: 2
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

28.3
28.4
28.5
198
Signature Bytes
Calibration Bytes
Page Size
ATmega406
All Atmel microcontrollers have a three-byte signature code which identifies the device. This
code can be read in both serial and parallel mode, also when the device is locked. The three
bytes reside in a separate address space.
For the ATmega406 the signature bytes are:
1. 0x000: 0x1E (indicates manufactured by Atmel).
2. 0x001: 0x95 (indicates 40KB Flash memory).
3. 0x002: 0x07(indicates ATmega406 device when 0x001 is 0x95).
The ATmega406 has calibration bytes for the Fast RC Oscillator, Slow RC Oscillator, internal
voltage reference, internal temperature reference and each differential cell voltage input. These
bytes reside in the high bytes in the signature address space. During Reset, the calibration byte
for the Fast RC Oscillator is automatically written into the corresponding calibration register. The
other calibration bytes should be handled by the application software. See
ture Row from Software” on page 189
Table 28-5.
Table 28-6.
20K words (40K bytes)
EEPROM Size
Flash Size
512 bytes
No. of Words in a Page and No. of Pages in the Flash
No. of Words in a Page and No. of Pages in the EEPROM
Page Size
Page Size
4 bytes
64 words
for details.
PCWORD
EEA[1:0]
PCWORD
PC[5:0]
No. of Pages
No. of Pages
128
320
PCPAGE
EEA[8:2]
PCPAGE
PC[14:6]
”Reading the Signa-
2548E–AVR–07/06
EEAMSB
PCMSB
14
8