ATmega8 Atmel Corporation, ATmega8 Datasheet - Page 48

• 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

48
ATmega8(L)
When the BOOTRST Fuse is unprogrammed, the boot section size set to 2Kbytes and the
IVSEL bit in the GICR Register is set before any interrupts are enabled, the most typical and
general program setup for the Reset and Interrupt Vector Addresses is:
When the BOOTRST Fuse is programmed and the boot section size set to 2Kbytes, the most
typical and general program setup for the Reset and Interrupt Vector Addresses is:
AddressLabels Code
$000
;
$001
$002
$003
$004
$005
$006
;
.org $c01
$c01
$c02
...
$c12
AddressLabels Code
.org $001
$001
$002
...
$012
;
.org $c00
$c00
;
$c01
$c02
$c03
$c04
$c05
$c06
RESET:ldi
RESET:ldi
rjmp
out
ldi
out
sei
<instr>
rjmp
rjmp
...
rjmp
rjmp
rjmp
...
rjmp
rjmp
out
ldi
out
sei
<instr>
RESET
r16,high(RAMEND); Main program start
SPH,r16
r16,low(RAMEND)
SPL,r16
EXT_INT0
EXT_INT1
... ;
SPM_RDY
EXT_INT0
EXT_INT1
...
SPM_RDY
RESET
r16,high(RAMEND); Main program start
SPH,r16
r16,low(RAMEND)
SPL,r16
xxx
xxx
; Enable interrupts
; IRQ0 Handler
; IRQ1 Handler
; Store Program Memory Ready Handler
Comments
; IRQ0 Handler
; IRQ1 Handler
;
; Store Program Memory Ready Handler
; Reset handler
; Set Stack Pointer to top of RAM
; Enable interrupts
Comments
; Reset handler
; Set Stack Pointer to top of RAM
2486Z–AVR–02/11