ATmega329P Atmel Corporation, ATmega329P Datasheet - Page 33
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ATmega329P
Manufacturer Part Number
ATmega329P
Description
Manufacturer
Atmel Corporation
Specifications of ATmega329P
Flash (kbytes)
32 Kbytes
Pin Count
64
Max. Operating Frequency
20 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
Yes
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
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Company
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Manufacturer
Quantity
Price
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101
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8.8
8.9
8.10
8021G–AVR–03/11
Clock Output Buffer
Timer/Counter Oscillator
System Clock Prescaler
Table 8-12.
When applying an external clock, it is required to avoid sudden changes in the applied clock fre-
quency to ensure stable operation of the MCU. A variation in frequency of more than 2% from
one clock cycle to the next can lead to unpredictable behavior. It is required to ensure that the
MCU is kept in Reset during such changes in the clock frequency.
Note that the System Clock Prescaler can be used to implement run-time changes of the internal
clock frequency while still ensuring stable operation. Refer to
33
When the CKOUT Fuse is programmed, the system Clock will be output on CLKO. This mode is
suitable when the chip clock is used to drive other circuits on the system. The clock will be out-
put also during reset and the normal operation of I/O pin will be overridden when the fuse is
programmed. Any clock source, including internal RC Oscillator, can be selected when CLKO
serves as clock output. If the System Clock Prescaler is used, it is the divided system clock that
is output when the CKOUT Fuse is programmed.
ATmega329P/3290P uses the same crystal oscillator for Low-frequency Oscillator and
Timer/Counter Oscillator. See
oscillator and crystal requirements.
ATmega329P/3290P share the Timer/Counter Oscillator Pins (TOSC1 and TOSC2) with XTAL1
and XTAL2. When using the Timer/Counter Oscillator, the system clock needs to be four times
the oscillator frequency. Due to this and the pin sharing, the Timer/Counter Oscillator can only
be used when the Calibrated Internal RC Oscillator is selected as system clock source.
Applying an external clock source to TOSC1 can be done if EXTCLK in the ASSR Register is
written to logic one. See
description on selecting external clock as input instead of a 32.768kHz watch crystal.
The ATmega329P/3290P system clock can be divided by setting the Clock Prescale Register –
CLKPR. This feature can be used to decrease power consumption when the requirement for
processing power is low. This can be used with all clock source options, and it will affect the
clock frequency of the CPU and all synchronous peripherals. clk
are divided by a factor as shown in
SUT1..0
for details.
00
01
10
11
Start-up Time from Power-
Start-up Times for the External Clock Selection
down and Power-save
6 CK
6 CK
6 CK
”Asynchronous Operation of Timer/Counter2” on page 152
”Low-frequency Crystal Oscillator” on page 30
Table 8-13 on page
Additional Delay from
Reset (V
Reserved
14CK + 4.1ms
14CK + 65ms
14CK
36.
CC
ATmega329P/3290P
= 5.0V)
”System Clock Prescaler” on page
I/O
, clk
BOD enabled
Fast rising power
Slowly rising power
ADC
Recommended Usage
, clk
for details on the
CPU
, and clk
for further
FLASH
33
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