ATMEGA2561V ATMEL [ATMEL Corporation], ATMEGA2561V Datasheet - Page 350

• Manufacturer Part Number: ATMEGA2561V
• Description: 8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Programming the EEPROM
350
ATmega640/1280/1281/2560/2561
1. 1. Set XA1, XA0 to “10”. This enables command loading.
2. Set DATA to “0000 0000”. This is the command for No Operation.
3. Give XTAL1 a positive pulse. This loads the command, and the internal write sig-
Figure 139. Addressing the Flash Which is Organized in Pages
Note:
Figure 140. Programming the Flash Waveforms
Note:
The EEPROM is organized in pages, see Table 156 on page 345. 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 348 for details on
Command, Address and Data loading):
RESET +12V
RDY/BSY
PAGEL
XTAL1
nals are reset.
DATA
XA1
XA0
BS1
BS2
WR
OE
PROGRAM MEMORY
1. PCPAGE and PCWORD are listed in Table 155 on page 345.
1. “XX” is don’t care. The letters refer to the programming description above.
0x10
PROGRAM
COUNTER
A
PAGE
ADDR. LOW
PAGE ADDRESS
WITHIN THE FLASH
B
PCMSB
DATA LOW
C
PCPAGE
DATA HIGH
D
XX
E
ADDR. LOW
B
PAGEMSB
PCWORD
DATA LOW
C
WORD ADDRESS
WITHIN A PAGE
F
DATA HIGH
(1)
D
INSTRUCTION WORD
XX
E
PAGE
ADDR. HIGH
G
ADDR. EXT.H
(1)
H
I
XX
PCWORD[PAGEMSB:0]:
00
01
02
PAGEEND
2549K–AVR–01/07