ATMEGA8L-8AUR Atmel, ATMEGA8L-8AUR Datasheet - Page 222
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ATMEGA8L-8AUR
Manufacturer Part Number
ATMEGA8L-8AUR
Description
MCU AVR 8KB FLASH 8MHZ 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA8L-8MU.pdf
(302 pages)
Specifications of ATMEGA8L-8AUR
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
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
*
Package
32TQFP
Device Core
AVR
Family Name
ATmega
Maximum Speed
8 MHz
Operating Supply Voltage
3.3|5 V
Data Bus Width
8 Bit
Number Of Programmable I/os
23
Interface Type
SPI/TWI/USART
On-chip Adc
8-chx10-bit
Number Of Timers
3
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
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Part Number:
ATMEGA8L-8AUR
Manufacturer:
Atmel
Quantity:
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Programming the
Flash
222
ATmega8(L)
The Flash is organized in pages, see
program data is latched into a page buffer. This allows one page of program data to be pro-
grammed simultaneously. The following procedure describes how to program the entire Flash
memory:
A. Load Command “Write Flash”
1. Set XA1, XA0 to “10”. This enables command loading
2. Set BS1 to ”0”
3. Set DATA to “0001 0000”. This is the command for Write Flash
4. Give XTAL1 a positive pulse. This loads the command
B. Load Address Low byte
1. Set XA1, XA0 to “00”. This enables address loading
2. Set BS1 to “0”. This selects low address
3. Set DATA = Address Low byte (0x00 - 0xFF)
4. Give XTAL1 a positive pulse. This loads the address Low byte
C. Load Data Low byte
1. Set XA1, XA0 to “01”. This enables data loading
2. Set DATA = Data Low byte (0x00 - 0xFF)
3. Give XTAL1 a positive pulse. This loads the data byte
D. Load Data High byte
1. Set BS1 to “1”. This selects high data byte
2. Set XA1, XA0 to “01”. This enables data loading
3. Set DATA = Data High byte (0x00 - 0xFF)
4. Give XTAL1 a positive pulse. This loads the data byte
E. Latch Data
1. Set BS1 to “1”. This selects high data byte
2. Give PAGEL a positive pulse. This latches the data bytes (see
F. Repeat B through E until the entire buffer is filled or until all data within the page is loaded
While the lower bits in the address are mapped to words within the page, the higher bits address
the pages within the FLASH. This is illustrated in
eight bits are required to address words in the page (pagesize <256), the most significant bit(s)
in the address Low byte are used to address the page when performing a page write.
G. Load Address High byte
1. Set XA1, XA0 to “00”. This enables address loading
2. Set BS1 to “1”. This selects high address
3. Set DATA = Address High byte (0x00 - 0xFF)
4. Give XTAL1 a positive pulse. This loads the address High byte
H. Program Page
1. Set BS1 = “0”
2. Give WR a negative pulse. This starts programming of the entire page of data. RDY/BSY
3. Wait until RDY/BSY goes high. (See
for signal waveforms)
goes low
Table 89 on page
Figure 106 on page 224
Figure 105 on page
218. When programming the Flash, the
for signal waveforms)
Figure 106 on page 224
223. Note that if less than
2486Z–AVR–02/11
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