ATmega168P Atmel Corporation, ATmega168P Datasheet - Page 33

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ATmega168P

Manufacturer Part Number
ATmega168P
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of ATmega168P

Flash (kbytes)
16 Kbytes
Pin Count
32
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
23
Ext Interrupts
24
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
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
Yes
Crypto Engine
No
Sram (kbytes)
1
Eeprom (bytes)
512
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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9.5
8025M–AVR–6/11
Low Frequency Crystal Oscillator
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.
ATmega48P/88P/168P oscillator is optimized for very low power consumption, and thus when
selecting crystals, see
9.0 pF and 12.5 pF crystals
Table 9-7.
Note:
Table 9-8.
The Low-frequency Crystal Oscillator provides an internal load capacitance of typical 6 pF at
each TOSC pin. The external capacitance (C) needed at each TOSC pin can be calculated by
using:
where CL is the load capacitance for a 32.768 kHz crystal specified by the crystal vendor and C
is the total stray capacitance for one TOSC pin.
Crystals specifying load capacitance (CL) higher than 6 pF, require external capacitors applied
as described in
The Low-frequency Crystal Oscillator must be selected by setting the CKSEL Fuses to “0110” or
“0111”, as shown in
Table
Table 9-9.
ATmega48P/88P/169P
SUT[1:0]
00
01
10
11
9-9.
1. Maximum ESR is typical value based on characterization
Device
Maximum ESR Recommendation for 32.768 kHz Crystal
Capacitance for the Low-frequency Crystal Oscillator
Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
Additional Delay from Reset (V
Figure 9-2 on page
Crystal CL (pF)
Table
12.5
6.5
9.0
Table 9-7 on page 33
9-10. Start-up times are determined by the SUT Fuses as shown in
4 CK + 4.1 ms
4 CK + 65 ms
System Osc.
32 kHz Osc.
Timer Osc.
4 CK
Type
30.
C
=
CC
2 CL
for maximum ESR recommendations on 6.5 pF,
= 5.0V)
Reserved
C
(Xtal1/Tosc1)
ATmega48P/88P/168P
s
Recommended Usage
Fast rising power or BOD enabled
Slowly rising power
Stable frequency at start-up
18 pF
18 pF
Cap
Max ESR [kΩ]
75
65
30
(Xtal2/Tosc2)
(1)
8 pF
8 pF
Cap
33
S

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