ATMEGA8L ATMEL [ATMEL Corporation], ATMEGA8L Datasheet - Page 227

• Manufacturer Part Number: ATMEGA8L
• Description: 8-bit AVR with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Programming the EEPROM
2486M–AVR–12/03
Figure 106. Programming the Flash Waveforms
Note:
The EEPROM is organized in pages, see Table 94 on page 224. When programming
the 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 “Programming the Flash” on page 225 for details on
Command, Address and 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.
3. Wait until to RDY/BSY goes high before programming the next page.
RESET +12V
RDY/BSY
RDY/BSY goes low.
(See Figure 107 for signal waveforms).
PAGEL
XTAL1
DATA
XA1
XA0
BS1
BS2
WR
OE
1. “XX” is don’t care. The letters refer to the programming description above.
0x10
A
ADDR. LOW
B
DATA LOW
C
DATA HIGH
D
XX
E
ADDR. LOW
B
DATA LOW
C
(1)
F
DATA HIGH
D
E
XX
ADDR. HIGH
ATmega8(L)
G
H
XX
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