ATmega88 Atmel Corporation, ATmega88 Datasheet - Page 31
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ATmega88
Manufacturer Part Number
ATmega88
Description
Manufacturer
Atmel Corporation
Specifications of ATmega88
Flash (kbytes)
8 Kbytes
Pin Count
32
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
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
No
Crypto Engine
No
Sram (kbytes)
1
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
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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9.4
2545T–AVR–05/11
Full swing crystal oscillator
Table 9-4.
Notes:
Pins XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which can be
configured for use as an On-chip Oscillator, as shown in
crystal or a ceramic resonator may be used.
This Crystal Oscillator is a full swing oscillator, with rail-to-rail swing on the XTAL2 output. This is
useful for driving other clock inputs and in noisy environments. The current consumption is
higher than the
lator will only operate for V
C1 and C2 should always be equal for both crystals and resonators. The optimal value of the
capacitors depends on the crystal or resonator in use, the amount of stray capacitance, and the
electromagnetic noise of the environment. Some initial guidelines for choosing capacitors for
use with crystals are given in
ues given by the manufacturer should be used.
The operating mode is selected by the fuses CKSEL3..1 as shown in
Table 9-5.
Notes:
Oscillator source/
power conditions
Crystal Oscillator,
BOD enabled
Crystal Oscillator,
fast rising power
Crystal Oscillator,
slowly rising power
Frequency range (MHz)
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. If 8MHz frequency exceeds the specification of the device (depends on V
0.4 - 20
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.
Fuse can be programmed in order to divide the internal frequency by eight. It must be ensured
that the resulting divided clock meets the frequency specification of the device.
Start-up times for the low power crystal oscillator clock selection. (Continued)
Full swing crystal oscillator operating modes
“Low power crystal oscillator” on page
CC
Start-up time from
= 2.7V - 5.5V.
Table 9-6 on page
power-down and
power-save
16KCK
16KCK
16KCK
capacitors C1 and C2 (pF)
Recommended range for
12 - 22
32. For ceramic resonators, the capacitor val-
Additional delay
29. Note that the Full Swing Crystal Oscil-
14CK + 4.1ms
14CK + 65ms
(V
from reset
Figure 9-2 on page
CC
(1)
14CK
= 5.0V)
.
ATmega48/88/168
Table
CKSEL3..1
CKSEL0
9-5.
CC
30. Either a quartz
1
1
1
), the CKDIV8
011
SUT1..0
01
10
11
31