ATmega8 Atmel Corporation, ATmega8 Datasheet - Page 65

• 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

Register Description for I/O Ports
The Port B Data
Register – PORTB
The Port B Data
Direction Register –
DDRB
The Port B Input Pins
Address – PINB
The Port C Data
Register – PORTC
The Port C Data
Direction Register –
DDRC
The Port C Input Pins
Address – PINC
The Port D Data
Register – PORTD
The Port D Data
Direction Register –
DDRD
The Port D Input Pins
Address – PIND
2486Z–AVR–02/11
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
PORTB7
PORTD7
PINB7
PIND7
DDB7
DDD7
R/W
R/W
R/W
R/W
N/A
N/A
R
R
R
R
R
7
0
7
0
7
7
0
7
–
0
7
–
0
7
0
7
0
7
–
PORTB6
PORTC6
PORTD6
PINB6
PINC6
PIND6
DDB6
DDC6
DDD6
R/W
R/W
R/W
R/W
R/W
R/W
N/A
N/A
N/A
6
0
6
0
6
R
6
0
6
0
6
R
6
0
6
0
6
R
PORTB5
PORTC5
PORTD5
PINB5
PINC5
PIND5
DDB5
DDC5
DDD5
R/W
R/W
R/W
R/W
R/W
R/W
N/A
N/A
N/A
R
R
R
5
0
5
0
5
5
0
5
0
5
5
0
5
0
5
PORTB4
PORTC4
PORTD4
PINB4
PINC4
PIND4
DDB4
DDC4
DDD4
R/W
R/W
R/W
R/W
R/W
R/W
N/A
N/A
N/A
R
R
R
4
0
4
0
4
4
0
4
0
4
4
0
4
0
4
PORTB3
PORTC3
PORTD3
PINB3
PINC3
PIND3
DDB3
DDC3
DDD3
R/W
R/W
R/W
R/W
R/W
R/W
N/A
N/A
N/A
R
R
R
3
0
3
0
3
3
0
3
0
3
3
0
3
0
3
PORTB2
PORTC2
PORTD2
PINB2
PINC2
PIND2
DDB2
DDC2
DDD2
R/W
R/W
R/W
R/W
R/W
R/W
N/A
N/A
N/A
R
R
R
2
0
2
0
2
2
0
2
0
2
2
0
2
0
2
PORTB1
PORTC1
PORTD1
PINB1
PINC1
PIND1
DDB1
DDC1
DDD1
R/W
R/W
R/W
R/W
R/W
R/W
N/A
N/A
N/A
R
R
R
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
PORTB0
PORTC0
PORTD0
PINB0
PINC0
PIND0
ATmega8(L)
DDB0
DDC0
DDD0
R/W
R/W
R/W
R/W
R/W
R/W
N/A
N/A
N/A
R
R
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
PORTB
PORTC
PORTD
DDRB
DDRC
DDRD
PINB
PINC
PIND
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