ATmega8 Atmel Corporation, ATmega8 Datasheet - Page 71

• Manufacturer Part Number: ATmega8
• Manufacturer: Atmel Corporation

Specifications of ATmega8

• 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
• Output Compare Channels: 3
• Input Capture Channels: 1
• Pwm Channels: 3
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

8-bit
Timer/Counter
Register
Description
Timer/Counter Control
Register – TCCR0
2486Z–AVR–02/11
Figure 28. Timer/Counter Timing Diagram, No Prescaling
Figure 29
Figure 29. Timer/Counter Timing Diagram, with Prescaler (f
• Bit 2:0 – CS02:0: Clock Select
The three clock select bits select the clock source to be used by the Timer/Counter.
Bit
Read/Write
Initial Value
TCNTn
TCNTn
(clk
(clk
TOVn
TOVn
clk
clk
clk
clk
I/O
I/O
I/O
Tn
I/O
Tn
/1)
shows the same timing data, but with the prescaler enabled.
/8)
R
7
–
0
MAX - 1
MAX - 1
R
6
–
0
R
5
–
0
R
4
–
0
MAX
MAX
R
3
–
0
CS02
R/W
2
0
BOTTOM
clk_I/O
BOTTOM
CS01
R/W
1
0
/8)
CS00
R/W
ATmega8(L)
0
0
BOTTOM + 1
BOTTOM + 1
TCCR0
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