ATmega8A Atmel Corporation, ATmega8A Datasheet - Page 246

• Manufacturer Part Number: ATmega8A
• Manufacturer: Atmel Corporation

Specifications of ATmega8A

• Flash (kbytes): 8 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 23
• Ext Interrupts: 2
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• 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: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Pwm Channels: 3
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

25.3
25.4
25.4.1
25.4.2
8159D–AVR–02/11
Speed Grades
Clock Characteristics
External Clock Drive Waveforms
External Clock Drive
Figure 25-1. Maximum Frequency vs. Vcc
Figure 25-2. External Clock Drive Waveforms
Table 25-1.
Symbol
1/t
t
t
t
t
t
Δ
CLCL
CHCX
CLCX
CLCH
CHCL
t
CLCL
CLCL
Parameter
Oscillator Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
Change in period from one
clock cycle to the next
16 MHz
External Clock Drive
8 MHz
V
IL1
V
IH1
2.7V
Safe Operating Area
V
Min
CC
125
50
50
0
= 2.7V to
4.5V
Max
1.6
1.6
5.5
8
2
V
V
62.5
CC
Min
25
25
0
= 4.5V to
5.5V
ATmega8A
Max
0.5
0.5
5.5
16
2
V
Units
MHz
ns
ns
ns
μs
μs
%
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