ATmega8 Atmel Corporation, ATmega8 Datasheet - Page 227

• 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

Reading the Signature
Bytes
Reading the
Calibration Byte
Parallel Programming
Characteristics
2486Z–AVR–02/11
The algorithm for reading the Signature bytes is as follows (refer to
page 222
1. A: Load Command “0000 1000”
2. B: Load Address Low byte (0x00 - 0x02)
3. Set OE to “0”, and BS1 to “0”. The selected Signature byte can now be read at DATA.
4. Set OE to “1”
The algorithm for reading the Calibration bytes is as follows (refer to
page 222
1. A: Load Command “0000 1000”
2. B: Load Address Low byte, (0x00 - 0x03)
3. Set OE to “0”, and BS1 to “1”. The Calibration byte can now be read at DATA
4. Set OE to “1”
Figure 109. Parallel Programming Timing, Including some General Timing Requirements
Figure 110. Parallel Programming Timing, Loading Sequence with Timing Requirements
Note:
(DATA, XA0/1, BS1, BS2)
PAGEL
XTAL1
DATA
BS1
XA0
XA1
1. The timing requirements shown in
for details on Command and Address loading):
for details on Command and Address loading):
loading operation
Data & Contol
RDY/BSY
ADDR0 (Low Byte)
LOAD ADDRESS
PAGEL
XTAL1
(LOW BYTE)
WR
t
t
BVPH
DVXH
LOAD DATA
(LOW BYTE)
DATA (Low Byte)
t
t
XHXL
PHPL
Figure 109
t
t
t
t
t
XLXH
XLDX
PLBX
XLWL
PLWL
t
(that is, t
BVWL
(HIGH BYTE)
LOAD DATA
DATA (High Byte)
t
WL WH
t
XLPH
WLRL
DVXH
LOAD DATA
, t
“Programming the Flash” on
“Programming the Flash” on
XHXL
t
PLXH
t
, and t
ATmega8(L)
WLBX
LOAD ADDRESS
(LOW BYTE)
XLDX
ADDR1 (Low Byte)
) also apply to
t
WLRH
(1)
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