ATmega168 Atmel Corporation, ATmega168 Datasheet - Page 40
![no-image](/images/manufacturer_photos/0/0/79/atmel_corporation_sml.jpg)
ATmega168
Manufacturer Part Number
ATmega168
Description
Manufacturer
Atmel Corporation
Specifications of ATmega168
Flash (kbytes)
16 Kbytes
Pin Count
32
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
23
Ext Interrupts
24
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
1
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA168
Manufacturer:
AVAILINK
Quantity:
1 590
Company:
Part Number:
ATmega168-15AD
Manufacturer:
VISHAY
Quantity:
15 600
Part Number:
ATmega168-15AT1
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
ATmega168-15MT
Manufacturer:
ATMEL
Quantity:
686
Part Number:
ATmega168-15MT
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
ATmega168-15MT1
Manufacturer:
ATMEL
Quantity:
372
Part Number:
ATmega168-15MZ
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Part Number:
ATmega168-20AU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
10.3
10.4
10.5
2545T–AVR–05/11
ADC noise reduction mode
Power-down mode
Power-save mode
Idle mode enables the MCU to wake up from external triggered interrupts as well as internal
ones like the timer overflow and USART transmit complete interrupts. If wake-up from the ana-
log comparator interrupt is not required, the analog comparator can be powered down by setting
the ACD bit in the analog comparator control and status register – ACSR. This will reduce power
consumption in Idle mode. If the ADC is enabled, a conversion starts automatically when this
mode is entered.
When the SM2..0 bits are written to 001, the SLEEP instruction makes the MCU enter ADC
Noise Reduction mode, stopping the CPU but allowing the ADC, the external interrupts, the 2-
wire Serial Interface address watch, Timer/Counter2
(if enabled). This sleep mode basically halts clk
clocks to run.
This improves the noise environment for the ADC, enabling higher resolution measurements. If
the ADC is enabled, a conversion starts automatically when this mode is entered. Apart from the
ADC Conversion Complete interrupt, only an External Reset, a Watchdog System Reset, a
Watchdog Interrupt, a Brown-out Reset, a 2-wire Serial Interface address match, a
Timer/Counter2 interrupt, an SPM/EEPROM ready interrupt, an external level interrupt on INT0
or INT1 or a pin change interrupt can wake up the MCU from ADC Noise Reduction mode.
Note:
When the SM2..0 bits are written to 010, the SLEEP instruction makes the MCU enter power-
down mode. In this mode, the external oscillator is stopped, while the external interrupts, the 2-
wire serial Interface address watch, and the Watchdog continue operating (if enabled). Only an
external reset, a watchdog system reset, a watchdog interrupt, a brown-out reset, a 2-wire serial
interface address match, an external level interrupt on INT0 or INT1, or a pin change interrupt
can wake up the MCU. This sleep mode basically halts all generated clocks, allowing operation
of asynchronous modules only.
Note that if a level triggered interrupt is used for wake-up from power-down mode, the changed
level must be held for some time to wake up the MCU. Refer to
for details.
When waking up from power-down mode, there is a delay from the wake-up condition occurs
until the wake-up becomes effective. This allows the clock to restart and become stable after
having been stopped. The wake-up period is defined by the same CKSEL fuses that define the
reset time-out period, as described in
When the SM2..0 bits are written to 011, the SLEEP instruction makes the MCU enter power-
save mode. This mode is identical to power-down, with one exception:
If Timer/Counter2 is enabled, it will keep running during sleep. The device can wake up from
either timer overflow or output compare event from Timer/Counter2 if the corresponding
Timer/Counter2 interrupt enable bits are set in TIMSK2, and the global interrupt enable bit in
SREG is set.
1. Timer/Counter2 will only keep running in asynchronous mode, see
PWM and asynchronous operation” on page 140
“Clock sources” on page
I/O
, clk
(1)
CPU
, and the Watchdog to continue operating
for details.
, and clk
ATmega48/88/168
28.
“External interrupts” on page 66
FLASH
, while allowing the other
“8-bit Timer/Counter2 with
40