ATMEGA324PA-AUR Atmel, ATMEGA324PA-AUR Datasheet - Page 36

• Manufacturer Part Number: ATMEGA324PA-AUR
• Description: MCU AVR 32KB FLASH 20 MHZ 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA324PA-AUR

• 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: 32
• 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: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8152G–AVR–11/09
Ce - is optional external capacitors as described in
Ci - is is the pin capacitance in
CL - is the load capacitance for a 32.768 kHz crystal specified by the crystal vendor.
C
Crystals specifying load capacitance (CL) higher than the ones given in the
35, require external capacitors applied as described in
Figure 8-3.
Crystals specifying load capacitance (CL) higher than listed in
external capacitors applied as described in
To find suitable load capacitance for a 32.768 kHz crysal, please consult the crystal datasheet.
When this oscillator is selected, start-up times are determined by the SUT Fuses and CKSEL0
as shown in
Table 8-9.
Note:
Power Conditions
BOD enabled
Fast rising power
Slowly rising power
BOD enabled
Fast rising power
Slowly rising power
S
- is the total stray capacitance for one TOSC pin.
1. These options should only be used if frequency stability at start-up is not important for the
application.
Table
Crystal Oscillator Connections
Start-up Times for the Low Frequency Crystal Oscillator Clock Selection
8-9.
ATmega164PA/324PA/644PA/1284P
Start-up Time from
Power-down and
Table 8-8 on page 35
Reserved
Reserved
Power-save
32K CK
32K CK
32K CK
1K CK
1K CK
1K CK
Figure 8-2 on page
Figure 8-2 on page 32
Additional Delay
14CK + 4.1 ms
14CK + 65 ms
Figure 8-2 on page
14CK + 4.1 ms
14CK + 65 ms
(V
from Reset
CC
14CK
14CK
= 5.0V)
32.
(1)
Table 8-8 on page
(1)
(1)
32.
CKSEL0
Table 8-8 on page
0
0
0
0
1
1
1
1
35, require
SUT1..0
00
01
10
11
00
01
10
11
36