ATmega329 Atmel Corporation, ATmega329 Datasheet - Page 96

• Manufacturer Part Number: ATmega329
• Manufacturer: Atmel Corporation

Specifications of ATmega329

• Flash (kbytes): 32 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 54
• Ext Interrupts: 17
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Segment Lcd: 100
• 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): 2
• 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: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

14.6.1
96
ATmega329/3290/649/6490
Compare Output Mode and Waveform Generation
Figure 14-4. Compare Match Output Unit, Schematic
The general I/O port function is overridden by the Output Compare (OC0A) from the Waveform
Generator if either of the COM0A1:0 bits are set. However, the OC0A pin direction (input or out-
put) is still controlled by the Data Direction Register (DDR) for the port pin. The Data Direction
Register bit for the OC0A pin (DDR_OC0A) must be set as output before the OC0A value is vis-
ible on the pin. The port override function is independent of the Waveform Generation mode.
The design of the Output Compare pin logic allows initialization of the OC0A state before the
output is enabled. Note that some COM0A1:0 bit settings are reserved for certain modes of
operation.
The Waveform Generator uses the COM0A1:0 bits differently in Normal, CTC, and PWM
modes. For all modes, setting the COM0A1:0 = 0 tells the Waveform Generator that no action on
the OC0A Register is to be performed on the next compare match. For compare output actions
in the non-PWM modes refer to
4 on page
A change of the COM0A1:0 bits state will have effect at the first compare match after the bits are
written. For non-PWM modes, the action can be forced to have immediate effect by using the
FOC0A strobe bits.
See “Register Description” on page 103.
104, and for phase correct PWM refer to
COMnx1
COMnx0
FOCn
clk
I/O
Waveform
Generator
Table 14-3 on page
D
D
D
PORT
DDR
OCnx
Q
Q
Q
Table 14-5 on page
104. For fast PWM mode, refer to
1
0
105.
OCn
Pin
2552K–AVR–04/11
Table 14-