ATmega8 Atmel Corporation, ATmega8 Datasheet - Page 8

• 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 Summary
2486ZS–AVR–02/11
0x20
0x3D (0x5D)
0x3C (0x5C)
0x2D (0x4D)
0x2C (0x4C)
0x1D (0x3D)
0x1C (0x3C)
0x0D (0x2D)
0x0C (0x2C)
0x3E (0x5E)
0x3B (0x5B)
0x3A (0x5A)
0x2E (0x4E)
0x2B (0x4B)
0x2A (0x4A)
0x1E (0x3E)
0x1B (0x3B)
0x1A (0x3A)
0x0E (0x2E)
0x0B (0x2B)
0x0A (0x2A)
0x3F (0x5F)
0x39 (0x59)
0x38 (0x58)
0x37 (0x57)
0x36 (0x56)
0x35 (0x55)
0x34 (0x54)
0x33 (0x53)
0x32 (0x52)
0x31 (0x51)
0x30 (0x50)
0x2F (0x4F)
0x29 (0x49)
0x28 (0x48)
0x27 (0x47)
0x26 (0x46)
0x25 (0x45)
0x24 (0x44)
0x23 (0x43)
0x22 (0x42)
0x21 (0x41)
0x1F (0x3F)
0x19 (0x39)
0x18 (0x38)
0x17 (0x37)
0x16 (0x36)
0x15 (0x35)
0x14 (0x34)
0x13 (0x33)
0x12 (0x32)
0x11 (0x31)
0x10 (0x30)
0x0F (0x2F)
0x09 (0x29)
0x08 (0x28)
0x07 (0x27)
0x06 (0x26)
0x05 (0x25)
0x04 (0x24)
0x03 (0x23)
0x02 (0x22)
Address
(1)
(0x40)
(1)
Reserved
MCUCSR
Reserved
Reserved
Reserved
OSCCAL
OCR1AH
OCR1BH
ADCSRA
TCCR1A
TCCR1B
TCNT1H
OCR1AL
OCR1BL
MCUCR
TCNT1L
WDTCR
SPMCR
UBRRH
UCSRC
PORTB
PORTC
PORTD
UCSRA
UCSRB
ADMUX
TCCR0
TCCR2
EEARH
EEARL
UBRRL
Name
TIMSK
TCNT0
SFIOR
TCNT2
TWCR
ICR1H
DDRC
DDRD
TWDR
TWAR
SREG
ICR1L
OCR2
ASSR
EEDR
EECR
DDRB
SPDR
SPSR
SPCR
ACSR
ADCH
ADCL
GICR
GIFR
PINB
PINC
PIND
TIFR
UDR
SPH
SPL
COM1A1
PORTD7
PORTB7
URSEL
URSEL
EEAR7
SPMIE
TWINT
RXCIE
REFS1
OCIE2
ICNC1
PINB7
PIND7
INTF1
OCF2
FOC2
DDB7
DDD7
ADEN
TWA6
Bit 7
SPIE
INT1
SPIF
RXC
ACD
SP7
SE
–
–
–
–
–
–
–
–
–
–
–
I
COM1A0
PORTC6
PORTD6
RWWSB
PORTB6
WGM20
UMSEL
EEAR6
REFS0
TOIE2
TWEA
ICES1
PINB6
PINC6
PIND6
WCOL
TXCIE
INTF0
DDB6
DDC6
DDD6
ACBG
ADSC
TWA5
Bit 6
TOV2
INT0
SM2
SP6
SPE
TXC
T
–
–
–
–
–
–
–
–
–
COM1B1
PORTB5
PORTC5
PORTD5
TWSTA
COM21
EEAR5
ADLAR
TICIE1
UDRIE
PINB5
PINC5
PIND5
DORD
UDRE
UPM1
DDB5
DDC5
DDD5
ADFR
TWA4
Bit 5
ICF1
SM1
ACO
SP5
Timer/Counter1 – Output Compare Register A High byte
Timer/Counter1 – Output Compare Register B High byte
H
Timer/Counter1 – Output Compare Register A Low byte
Timer/Counter1 – Output Compare Register B Low byte
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Timer/Counter1 – Input Capture Register High byte
Timer/Counter1 – Input Capture Register Low byte
Timer/Counter1 – Counter Register High byte
Timer/Counter1 – Counter Register Low byte
Timer/Counter2 Output Compare Register
Two-wire Serial Interface Data Register
USART Baud Rate Register Low byte
RWWSRE
Oscillator Calibration Register
ADC Data Register High byte
ADC Data Register Low byte
COM1B0
PORTB4
PORTC4
PORTD4
OCIE1A
TWSTO
WGM13
COM20
OCF1A
EEAR4
WDCE
PINB4
PINC4
PIND4
MSTR
RXEN
UPM0
DDB4
DDC4
DDD4
USART I/O Data Register
TWA3
Bit 4
ADIF
SM0
SP4
Timer/Counter0 (8 Bits)
Timer/Counter2 (8 Bits)
EEPROM Data Register
ACI
FE
S
–
–
–
–
–
–
–
–
–
–
–
–
SPI Data Register
PORTB3
PORTC3
PORTD3
BLBSET
OCIE1B
WGM12
WGM21
OCF1B
TWWC
FOC1A
EEAR3
WDRF
EERIE
PINC3
ISC11
ACME
PINB3
PIND3
MUX3
TWA2
USBS
DDB3
DDC3
DDD3
CPOL
TXEN
Bit 3
WDE
DOR
ACIE
ADIE
SP3
AS2
V
–
–
–
–
–
–
TCN2UB
PORTB2
PORTC2
PORTD2
EEMWE
PGWRT
FOC1B
UCSZ1
EEAR2
UCSZ2
ADPS2
TWEN
PINC2
PIND2
TOIE1
ISC10
BORF
WDP2
PINB2
CPHA
MUX2
TWA1
TOV1
DDB2
DDC2
DDD2
Bit 2
SP10
CS02
CS12
CS22
ACIC
PUD
SP2
PE
N
–
–
–
–
UBRR[11:8]
OCR2UB
PORTB1
PORTC1
PORTD1
WGM11
PGERS
EXTRF
UCSZ0
EEAR1
ADPS1
IVSEL
ISC01
WDP1
EEWE
PINB1
PINC1
PIND1
ACIS1
PSR2
DDB1
DDC1
DDD1
SPR1
RXB8
MUX1
TWA0
Bit 1
CS01
CS11
CS21
SP9
SP1
U2X
Z
–
–
–
–
–
–
PORTC0
PORTD0
TCR2UB
PORTB0
WGM10
TWGCE
SPMEN
UCPOL
EEAR8
EEAR0
ADPS0
PSR10
MPCM
TOIE0
WDP0
PINB0
PINC0
PIND0
ACIS0
ISC00
PORF
EERE
DDB0
DDC0
DDD0
SPI2X
MUX0
ATmega8(L)
Bit 0
TOV0
TWIE
CS00
CS10
CS20
SPR0
TXB8
IVCE
SP8
SP0
C
–
58, 74, 120,
72, 100,
72, 101,
Page
49,
33,
206
165
100
100
114
116
116
117
152
150
127
126
125
148
148
149
152
186
199
200
201
167
167
201
11
13
13
67
41
71
72
31
96
98
99
99
99
99
99
99
43
20
20
20
20
65
65
65
65
65
65
65
65
65
67
66
119
119
186
8