ATMEGA328P-AU Atmel, ATMEGA328P-AU Datasheet - Page 34

• Manufacturer Part Number: ATMEGA328P-AU
• Description: MCU AVR 32K FLASH 32TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA328P-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 23
• 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): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-TQFP, 32-VQFP
• Processor Series: ATMEGA32x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 2 KB
• Interface Type: 2-Wire, SPI, USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 23
• Number Of Timers: 3
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• Cpu Family: ATmega
• Device Core: AVR
• Device Core Size: 8b
• Frequency (max): 20MHz
• Total Internal Ram Size: 2KB
• # I/os (max): 23
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 2.5/3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 1.8V
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 32
• Package Type: TQFP
• Controller Family/series: AVR MEGA
• No. Of I/o's: 23
• Eeprom Memory Size: 1KB
• Ram Memory Size: 2KB
• Cpu Speed: 20MHz
• Rohs Compliant: Yes
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAGATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVR
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ATMEGA328P-20AU; ATMEGA328P-20AU; Q3790246

9.6
8271D–AVR–05/11
Calibrated Internal RC Oscillator
Table 9-10.
Note:
By default, the Internal RC Oscillator provides an approximate 8.0MHz clock. Though voltage
and temperature dependent, this clock can be very accurately calibrated by the user. See
29-10 on page 323
See
This clock may be selected as the system clock by programming the CKSEL Fuses as shown in
Table
the pre-programmed calibration value into the OSCCAL Register and thereby automatically cali-
brates the RC Oscillator. The accuracy of this calibration is shown as Factory calibration in
29-10 on page
By changing the OSCCAL register from SW, see
page
The accuracy of this calibration is shown as User calibration in
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 9-11.
Notes:
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 9-12.
Note:
Power Conditions
BOD enabled
Fast rising power
Slowly rising power
CKSEL3...
0100
0101
”System Clock Prescaler” on page 36
38, it is possible to get a higher calibration accuracy than by using the factory calibration.
0
9-11. If selected, it will operate with no external components. During reset, hardware loads
9-12.
(1)
1. This option should only be used if frequency stability at start-up is not important for the
1. The device is shipped with this option selected.
2. If 8MHz frequency exceeds the specification of the device (depends on V
1. If the RSTDISBL fuse is programmed, this start-up time will be increased to
2.
The device is shipped with this option selected.
application
Frequency Range
Fuse can be programmed in order to divide the internal frequency by 8.
14CK + 4.1ms to ensure programming mode can be entered.
Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
Internal Calibrated RC Oscillator Operating Modes
Start-up times for the internal calibrated RC Oscillator clock selection
323.
for more details. The device is shipped with the CKDIV8 Fuse programmed.
7.3 - 8.1
Power-down and Power-save
ATmega48A/PA/88A/PA/168A/PA/328/P
Start-up Time from
(2)
Start-up Time from Power-
”Calibration Byte” on page
32K CK
(MHz)
1K CK
down and Power-save
Reserved
6 CK
6 CK
6 CK
for more details.
”OSCCAL – Oscillator Calibration Register” on
Recommended Usage
Stable frequency at start-up
302.
Additional Delay from
Reset (V
Table 29-10 on page
14CK + 65ms
14CK + 4.1ms
CKSEL3...0
14CK
0010
CC
(1)
(1)
= 5.0V)
(2)
CC
), the CKDIV8
323.
SUT1...0
00
01
10
11
Table
Table
34