ATmega329A Atmel Corporation, ATmega329A Datasheet - Page 33

• Manufacturer Part Number: ATmega329A
• Manufacturer: Atmel Corporation

Specifications of ATmega329A

• 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: 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

8284D–AVR–6/11
ATmega169A/PA/329A/PA/3290A/PA/649A/P/6490A/P
electromagnetic noise of the environment. Some initial guidelines for choosing capacitors for
use with crystals are given in
the manufacturer should be used.
Figure 9-2.
The Oscillator can operate in three different modes, each optimized for a specific frequency
range. The operating mode is selected by the fuses CKSEL3...1 as shown in
Table 9-5.
Note:
The CKSEL0 Fuse together with the SUT1...0 Fuses select the start-up times as shown in
9-6.
Table 9-6.
CKSEL0
0
0
0
0
1
CKSEL3..1
1. This option should not be used with crystals, only with ceramic resonators.
100
101
110
111
(1)
SUT1..0
Crystal Oscillator Connections
Crystal Oscillator Operating Modes
Start-up Times for the Crystal Oscillator Clock Selection
00
01
10
11
00
Start-up Time from
Frequency Range
Power-down and
Power-save
Table
258 CK
258 CK
0.4 - 0.9
0.9 - 3.0
3.0 - 8.0
1K CK
1K CK
1K CK
(MHz)
8.0 -
9-5. For ceramic resonators, the capacitor values given by
C2
C1
(2)
(2)
(2)
(1)
(1)
Recommended Range for Capacitors C1 and
Additional Delay
14CK + 4.1ms
14CK + 4.1ms
14CK + 65ms
14CK + 65ms
(V
from Reset
CC
14CK
XTAL2
XTAL1
GND
C2 for Use with Crystals (pF)
= 5.0V)
12 - 22
12 - 22
12 - 22
–
Ceramic resonator, fast
rising power
Ceramic resonator,
slowly rising power
Recommended Usage
Ceramic resonator, fast
Ceramic resonator,
Ceramic resonator,
slowly rising power
Table
BOD enabled
rising power
9-5.
Table
33