ATmega168 Atmel Corporation, ATmega168 Datasheet - Page 155
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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
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2545T–AVR–05/11
Table 18-6
mode.
Table 18-6.
Note:
Table 18-7
rect PWM mode.
Table 18-7.
Note:
• Bits 3, 2 – Res: Reserved bits
These bits are reserved bits in the Atmel ATmega48/88/168 and will always read as zero.
• Bits 1:0 – WGM21:0: Waveform generation mode
Combined with the WGM22 bit found in the TCCR2B Register, these bits control the counting
sequence of the counter, the source for maximum (TOP) counter value, and what type of wave-
form generation to be used, see
Timer/Counter unit are: Normal mode (counter), Clear Timer on Compare Match (CTC) mode,
and two types of Pulse Width Modulation (PWM) modes (see
145).
COM2B1
COM2B1
0
0
1
1
0
0
1
1
1. A special case occurs when OCR2B equals TOP and COM2B1 is set. In this case, the Com-
1. A special case occurs when OCR2B equals TOP and COM2B1 is set. In this case, the Com-
pare Match is ignored, but the set or clear is done at TOP. See
page 148
pare Match is ignored, but the set or clear is done at TOP. See
page 148
shows the COM2B1:0 bit functionality when the WGM22:0 bits are set to fast PWM
shows the COM2B1:0 bit functionality when the WGM22:0 bits are set to phase cor-
Compare output mode, fast PWM mode
Compare output mode, phase correct PWM mode
COM2B0
COM2B0
for more details.
for more details.
0
1
0
1
0
1
0
1
Description
Normal port operation, OC2B disconnected
Reserved
Clear OC2B on compare match, set OC2B at BOTTOM,
(non-inverting mode)
Set OC2B on compare match, clear OC2B at BOTTOM,
(invertiing mode)
Description
Normal port operation, OC2B disconnected
Reserved
Clear OC2B on compare match when up-counting
Set OC2B on compare match when down-counting
Set OC2B on compare match when up-counting
Clear OC2B on compare match when down-counting
Table 18-8 on page
156. Modes of operation supported by the
(1)
.
ATmega48/88/168
(1)
“Modes of operation” on page
.
“Phase correct PWM mode” on
“Phase correct PWM mode” on
155