ATmega8 Atmel Corporation, ATmega8 Datasheet - Page 214

• 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

214
ATmega8(L)
Table 83. Read-While-Write Limit
For details about these two section, see
and
Table 84. Explanation of Different Variables used in
to the Z-pointer
Note:
Section
Read-While-Write section (RWW)
No Read-While-Write section (NRWW)
Variable
PCMSB
PAGEMSB
ZPCMSB
ZPAGEMSB
PCPAGE
PCWORD
“RWW – Read-While-Write Section” on page
1. Z15:Z13: always ignored
Z0: should be zero for all SPM commands, byte select for the LPM instruction.
See
Z-pointer during Self-Programming
PC[11:5]
“Addressing the Flash During Self-Programming” on page 207
PC[4:0]
11
4
Corresponding
Z-value
Z12:Z6
Z5:Z1
Z12
Z5
(1)
“NRWW – No Read-While-Write Section” on page 203
Description
Most significant bit in the Program Counter.
(The Program Counter is 12 bits PC[11:0])
Most significant bit which is used to address the
words within one page (32 words in a page
requires 5 bits PC [4:0])
Bit in Z-register that is mapped to PCMSB.
Because Z0 is not used, the ZPCMSB equals
PCMSB + 1
Bit in Z-register that is mapped to PAGEMSB.
Because Z0 is not used, the ZPAGEMSB
equals PAGEMSB + 1
Program counter page address: Page select,
for page erase and page write
Program counter word address: Word select, for
filling temporary buffer (must be zero during
page write operation)
203.
Figure 103 on page 208
Pages
96
32
Address
0x000 - 0xBFF
0xC00 - 0xFFF
for details about the use of
and the Mapping
2486Z–AVR–02/11