ATmega324P Atmel Corporation, ATmega324P Datasheet - Page 34
ATmega324P
Manufacturer Part Number
ATmega324P
Description
Manufacturer
Atmel Corporation
Specifications of ATmega324P
Flash (kbytes)
32 Kbytes
Pin Count
44
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
32
Ext Interrupts
32
Usb Speed
No
Usb Interface
No
Spi
3
Twi (i2c)
1
Uart
2
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
Yes
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
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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6.5
8011O–AVR–07/10
Low Frequency Crystal Oscillator
Table 6-6.
Notes:
The Low-frequency Crystal Oscillator is optimized for use with a 32.768 kHz watch crystal.
When selecting crystals, load capasitance and crystal’s Equivalent Series Resistance, ESR
must be taken into consideration. Both values are specified by the crystal vendor.
ATmega164P/324P/644P oscillator is optimized for very low power consumption, and thus when
selecting crystals, see
12.5 pF crystals
Table 6-7.
Note:
The Low-frequency Crystal Oscillator provides an internal load capacitance,
page 34
Table 6-8.
Oscillator Source /
Power Conditions
Ceramic resonator, fast
rising power
Ceramic resonator, slowly
rising power
Crystal Oscillator, BOD
enabled
Crystal Oscillator, fast
rising power
Crystal Oscillator, slowly
rising power
ATmega164P/324P/644P
1. These options should only be used when not operating close to the maximum frequency of the
2. These options are intended for use with ceramic resonators and will ensure frequency stability
1. Maximum ESR is typical value based on characterization
at each TOSC pin.
Device
device, and only if frequency stability at start-up is not important for the application. These
options are not suitable for crystals.
at start-up. They can also be used with crystals when not operating close to the maximum fre-
quency of the device, and if frequency stability at start-up is not important for the application.
Start-up Times for the Full Swing Crystal Oscillator Clock Selection
Maximum ESR Recommendation for 32.768 kHz Watch Crystal
Capasitance for Low-frequency Oscillator.
Crystal CL (pF)
12.5
9.0
Table 6-7 on page 34
Start-up Time from
Power-down and
32 kHz Osc. Type
Power-save
System Osc.
Timer Osc.
16K CK
16K CK
16K CK
1K CK
1K CK
for maximum ESR recommendations on 9 pF and
ATmega164P/324P/644P
Additional Delay
Cap(Xtal1/Tosc1)
14CK + 4.1 ms
14CK + 65 ms
14CK + 4.1 ms
14CK + 65 ms
(V
from Reset
CC
14CK
18 pF
6 pF
= 5.0V)
Max ESR [kΩ]
(2)
(2)
65
30
CKSEL0
Cap(Xtal2/Tosc2)
(1)
0
1
1
1
1
seeTable 6-8 on
8 pF
6 pF
SUT1..0
11
00
01
10
11
34
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