ATMEGA329P-20MN Atmel, ATMEGA329P-20MN Datasheet - Page 32

• Manufacturer Part Number: ATMEGA329P-20MN
• Description: IC MCU AVR 32K 20MHZ 64QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA329P-20MN

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• 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: Lead free / RoHS Compliant

8.7
8021G–AVR–03/11
External Clock
When this Oscillator is used as the chip clock, the Watchdog Oscillator will still be used for the
Watchdog Timer and for the Reset Time-out. For more information on the pre-programmed cali-
bration value, see the section
Table 8-9.
Notes:
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table 8-10 on page
Table 8-10.
Note:
To drive the device from an external clock source, XTAL1 should be driven as shown in
8-3 on page
to “0000”.
Figure 8-3.
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Table 8-12 on page
Table 8-11.
Power Conditions
BOD enabled
Fast rising power
Slowly rising power
ATmega329P/3290P
1. The device is shipped with this option selected.
2. The frequency ranges are preliminary values.
3. If 8MHz frequency exceeds the specification of the device (depends on V
1. The device is shipped with this option selected
Fuse can be programmed in order to divide the internal frequency by 8.
32. To run the device on an external clock, the CKSEL Fuses must be programmed
Internal Calibrated RC Oscillator Operating Modes
Start-up times for the internal calibrated RC Oscillator clock selection
External Clock Drive Configuration
Crystal Oscillator Clock Frequency
Frequency Range
32.
33.
7.3 - 8.1
EXTERNAL
SIGNAL
CLOCK
Start-up Time from Power-
”Calibration Byte” on page
down and Power-save
NC
(2)
(MHz)
Reserved
6 CK
6 CK
6 CK
CKSEL3...0
0000
.
XTAL2
XTAL1
GND
299.
ATmega329P/3290P
Additional Delay from
Reset (V
14CK + 65 ms
14CK + 4.1 ms
(1)(3)
14CK
Frequency Range
0 - 20MHz
CC
CKSEL3...0
= 5.0V)
0010
CC
(1)
), the CKDIV8
SUT1...0
00
01
10
11
Figure
32