ATMEGA329-16MI Atmel, ATMEGA329-16MI Datasheet - Page 28
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ATMEGA329-16MI
Manufacturer Part Number
ATMEGA329-16MI
Description
IC AVR MCU 32K 16MHZ 64-QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA329-16MI
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
54
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-MLF®, 64-QFN
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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8.3
28
Crystal Oscillator
ATmega329/3290/649/6490
XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which can be con-
figured for use as an On-chip Oscillator, as shown in
ceramic resonator may be used.
C1 and C2 should always be equal for both crystals and resonators. The optimal value of the
capacitors depends on the crystal or resonator in use, the amount of stray capacitance, and the
electromagnetic noise of the environment. Some initial guidelines for choosing capacitors for
use with crystals are given in
the manufacturer should be used.
Figure 8-2.
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 8-3.
Notes:
The CKSEL0 Fuse together with the SUT1..0 Fuses select the start-up times as shown in
8-4.
Table 8-4.
CKSEL0
0
0
0
CKSEL3..1
100
1. This option should not be used with crystals, only with ceramic resonators.
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
Start-up Time from
Frequency Range
Power-down and
Power-save
258 CK
258 CK
0.4 - 0.9
0.9 - 3.0
3.0 - 8.0
1K CK
(MHz)
Table
8.0 -
(2)
(1)
(1)
8-3. For ceramic resonators, the capacitor values given by
C2
C1
Recommended Range for Capacitors C1
Additional Delay
14CK + 4.1ms
14CK + 65ms
(V
from Reset
and C2 for Use with Crystals (pF)
CC
14CK
= 5.0V)
Figure
XTAL2
XTAL1
GND
12 - 22
12 - 22
12 - 22
8-2. Either a quartz crystal or a
–
Recommended
Usage
Ceramic resonator,
fast rising power
Ceramic resonator,
slowly rising power
Ceramic resonator,
BOD enabled
Table
2552K–AVR–04/11
8-3.
Table
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