ATMEGA8A-PU Atmel, ATMEGA8A-PU Datasheet - Page 237

• Manufacturer Part Number: ATMEGA8A-PU
• Description: MCU AVR 8K FLASH 16MHZ 28-PDIP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8A-PU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 6x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-DIP (0.300", 7.62mm)
• Processor Series: ATMEGA8x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 1 KB
• Interface Type: SPI, TWI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 23
• Number Of Timers: 3
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 6 Channel
• Package: 28PDIP
• Device Core: AVR
• Family Name: ATmega
• Maximum Speed: 16 MHz
• Operating Supply Voltage: 3.3|5 V
• Controller Family/series: AVR MEGA
• No. Of I/o's: 23
• Eeprom Memory Size: 512Byte
• Ram Memory Size: 1KB
• Cpu Speed: 16MHz
• Rohs Compliant: Yes
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

24.7.12
24.7.13
24.7.14
8159D–AVR–02/11
Reading the Signature Bytes
Reading the Calibration Byte
Parallel Programming Characteristics
The algorithm for reading the Signature bytes is as follows (refer to
page 232
The algorithm for reading the Calibration bytes is as follows (refer to
page 232
Figure 24-4. Parallel Programming Timing, Including some General Timing Requirements
Figure 24-5. Parallel Programming Timing, Loading Sequence with Timing Requirements
Note:
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”.
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”.
PAGEL
XTAL1
(DATA, XA0/1, BS1, BS2)
DATA
BS1
XA0
XA1
1. The timing requirements shown in
for details on Command and Address loading):
for details on Command and Address loading):
ing 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 24-4
t
t
t
t
t
XLXH
XLDX
XLWL
PLBX
PLWL
(i.e., t
t
BVWL
(HIGH BYTE)
LOAD DATA
DATA (High Byte)
DVXH
t
WL WH
t
XLPH
WLRL
, t
LOAD DATA
XHXL
“Programming the Flash” on
“Programming the Flash” on
, and t
t
PLXH
t
WLBX
XLDX
ATmega8A
LOAD ADDRESS
(LOW BYTE)
) also apply to load-
ADDR1 (Low Byte)
t
WLRH
(1)
237