ATmega88 Atmel Corporation, ATmega88 Datasheet - Page 306

• Manufacturer Part Number: ATmega88
• 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

29.4
29.4.1
Table 29-1.
Notes:
29.4.2
29.4.3
2545T–AVR–05/11
Factory calibration
User calibration
Clock characteristics
1. Voltage range for Atmel ATmega48V/88V/168V.
2. Voltage range for Atmel ATmega48/88/168.
Calibrated internal RC oscillator accuracy
External clock drive waveforms
External clock drive
Calibration accuracy of internal RC oscillator.
Figure 29-3. External clock drive waveforms.
Table 29-2.
Symbol
1/t
t
t
t
t
t
Δ
CLCL
CHCX
CLCX
CLCH
CHCL
7.3MHz - 8.1MHz
t
CLCL
CLCL
Frequency
8.0MHz
Parameter
Oscillator
frequency
Clock period
High time
Low time
Rise time
Fall time
Change in period
from one clock
cycle to the next
V
External clock drive.
IL1
V
IH1
1.8V - 5.5V
2.7V - 5.5V
V
V
3V
Min.
CC
CC
250
100
100
0
= 1.8V - 5.5V
(1)
(2)
Max.
2.0
2.0
4
2
V
Min.
CC
Temperature
100
-40°C - 85°C
40
40
0
= 2.7V - 5.5V
25°C
Max.
ATmega48/88/168
1.6
1.6
10
2
V
Min.
CC
50
20
20
0
Calibration accuracy
= 4.5V - 5.5V
Max.
±10%
±1%
0.5
0.5
20
2
Units
MHz
ns
μs
%
306