ATmega8 Atmel Corporation, ATmega8 Datasheet - Page 224

• 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

Programming the
EEPROM
224
ATmega8(L)
Figure 106. Programming the Flash Waveforms
Note:
The EEPROM is organized in pages, see
EEPROM, the program data is latched into a page buffer. This allows one page of data to be
programmed simultaneously. The programming algorithm for the EEPROM Data memory is as
follows (refer to
Data loading):
1. A: Load Command “0001 0001”
2. G: Load Address High byte (0x00 - 0xFF)
3. B: Load Address Low byte (0x00 - 0xFF)
4. C: Load Data (0x00 - 0xFF)
5. E: Latch data (give PAGEL a positive pulse)
K: Repeat 3 through 5 until the entire buffer is filled
L: Program EEPROM page
1. Set BS1 to “0”
2. Give WR a negative pulse. This starts programming of the EEPROM page. RDY/BSY
3. Wait until to RDY/BSY goes high before programming the next page (see
goes low
page 225
RESET +12V
RDY/BSY
PAGEL
1. “XX” is don’t care. The letters refer to the programming description above
XTAL1
DATA
XA1
XA0
BS1
BS2
WR
OE
for signal waveforms)
“Programming the Flash” on page 222
0x10
A
ADDR. LOW
B
DATA LOW
C
DATA HIGH
D
E
XX
ADDR. LOW
Table 90 on page
B
(1)
DATA LOW
C
F
DATA HIGH
for details on Command, Address and
D
E
XX
218. When programming the
ADDR. HIGH
G
H
XX
Figure 107 on
2486Z–AVR–02/11