ATmega406 Atmel Corporation, ATmega406 Datasheet - Page 30
ATmega406
Manufacturer Part Number
ATmega406
Description
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATmega406-1AAU
Manufacturer:
AT
Quantity:
20 000
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ATmega406
• Bit 0 - ACS: Asynchronous Clock Select
The ACS bit is used to selected the source of the asynchronous clock for the Coulomb Counter
ADC and Wake-up Timer. The Slow RC Oscillator is selected when this bit is cleared (zero). The
32 kHz Crystal Oscillator is selected when this bit is set (one).
The selected clock source and oscillator enable conditions are illustrated in
Table 7-4.
Recommended algorithm for switching from the RC Oscillator to the Crystal Oscillator as the
asynchronous clock for the Coulomb Counter ADC and Wake-up Timer:
1. Enable the Crystal Oscillator by setting the XOE bit (one).
2. Enable the Wake-up Timer, select a two second timeout, and reset the Wake-up Timer
3. Wait for the Wake-up Timer time-out.
4. Switch to the Crystal Oscillator by setting the ACS bit (one) while keeping the XOE bit set
5. Optional: Wait for another Wake-up Timer time-out, to ensure the Crystal Oscillator is
Recommended algorithm for switching from the Crystal Oscillator to the RC Oscillator as the
asynchronous clock for the Coulomb Counter ADC and Wake-up Timer:
1. Switch to the RC Oscillator by clearing the ACS bit (zero) while keeping the XOE bit set
2. Disable the Crystal Oscillator by clearing the XOE bit (zero) while keeping the ACS bit
Sleep Mode
Power-off or Power-down
Other Sleep Modes
Active Mode
(”Wake-up Timer” on page 49
(one).
operating correctly. This can be done by enabling another timer interrupt with significantly
longer time-out, and checking that the Wake-up Timer time-out occurs first.
(one).
cleared (zero).
Asynchronous Clock Source and Oscillator Enable Conditions
32 kHz Crystal
Oscillator Enable
0
XOE
XOE
for details).
Slow RC
Oscillator Enable
0
ACS & (CADEN | WUTEN)
1
Table
7-4.
2548E–AVR–07/06
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