ATMEGA8A-AUR Atmel, ATMEGA8A-AUR Datasheet - Page 231
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ATMEGA8A-AUR
Manufacturer Part Number
ATMEGA8A-AUR
Description
MCU AVR 8KB FLASH 16MHZ 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA8A-MU.pdf
(308 pages)
Specifications of ATMEGA8A-AUR
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 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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24.7
24.7.1
24.7.2
8159D–AVR–02/11
Parallel Programming
Enter Programming Mode
Considerations for Efficient Programming
Table 24-10. Command Byte Bit Coding
The following algorithm puts the device in Parallel Programming mode:
Note, if the RESET pin is disabled by programming the RSTDISBL Fuse, it may not be possible
to follow the proposed algorithm above. The same may apply when External Crystal or External
RC configuration is selected because it is not possible to apply qualified XTAL1 pulses. In such
cases, the following algorithm should be followed:
The loaded command and address are retained in the device during programming. For efficient
programming, the following should be considered.
1. Apply 4.5 - 5.5V between V
2. Set RESET to “0” and toggle XTAL1 at least 6 times
3. Set the Prog_enable pins listed in
4. Apply 11.5 - 12.5V to RESET. Any activity on Prog_enable pins within 100ns after +12V
1. Set Prog_enable pins listed in
2. Apply 4.5 - 5.5V between V
3. Wait 100 ns.
4. Re-program the fuses to ensure that External Clock is selected as clock source
5. Exit Programming mode by power the device down or by bringing RESET pin to 0’b0.
6. Entering Programming mode with the original algorithm, as described above.
• The command needs only be loaded once when writing or reading multiple memory
• Skip writing the data value 0xFF, that is the contents of the entire EEPROM (unless the
• Address High byte needs only be loaded before programming or reading a new 256 word
locations.
EESAVE Fuse is programmed) and Flash after a Chip Erase.
window in Flash or 256byte EEPROM. This consideration also applies to Signature bytes
reading.
100 ns.
has been applied to RESET, will cause the device to fail entering Programming mode.
RESET.
(CKSEL3:0 = 0’b0000) and RESET pin is activated (RSTDISBL unprogrammed). If
Lock Bits are programmed, a chip erase command must be executed before changing
the fuses.
Command Byte
0000 1000
0000 0100
0000 0010
0000 0011
Command Executed
Read Signature Bytes and Calibration byte
Read Fuse and Lock Bits
Read Flash
Read EEPROM
CC
CC
and GND, and wait at least 100µs.
and GND simultaneously as 11.5 - 12.5V is applied to
Table 24-8 on page 230
Table 24-8 on page 230
to “0000”.
to “0000” and wait at least
ATmega8A
231
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