ATMEGA8L ATMEL [ATMEL Corporation], ATMEGA8L Datasheet - Page 212

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

Self-Programming the
Flash
212
ATmega8(L)
Figure 103. Addressing the Flash during SPM
Notes:
The Program memory is updated in a page by page fashion. Before programming a
page with the data stored in the temporary page buffer, the page must be erased. The
temporary page buffer is filled one word at a time using SPM and the buffer can be filled
either before the page erase command or between a page erase and a page write
operation:
Alternative 1, fill the buffer before a page erase.
•
•
•
Alternative 2, fill the buffer after page erase.
•
•
•
If only a part of the page needs to be changed, the rest of the page must be stored (for
example in the temporary page buffer) before the erase, and then be rewritten. When
using alternative 1, the boot loader provides an effective Read-Modify-Write feature
which allows the user software to first read the page, do the necessary changes, and
then write back the modified data. If alternative 2 is used, it is not possible to read the
old data while loading since the page is already erased. The temporary page buffer can
be accessed in a random sequence. It is essential that the page address used in both
the page erase and page write operation is addressing the same page. See “Simple
Z - REGISTER
Fill temporary page buffer.
Perform a page erase.
Perform a page write.
Perform a page erase.
Fill temporary page buffer.
Perform a page write.
PROGRAM MEMORY
BIT
1. The different variables used in the figure are listed in Table 84 on page 218.
2. PCPAGE and PCWORD are listed in Table 93 on page 224.
PROGRAM
COUNTER
15
PAGE
PAGE ADDRESS
WITHIN THE FLASH
ZPCMSB
PCMSB
PCPAGE
ZPAGEMSB
PAGEMSB
PCWORD
WORD ADDRESS
WITHIN A PAGE
1
(1)
0
0
INSTRUCTION WORD
PAGE
PCWORD[PAGEMSB:0]:
00
01
02
PAGEEND
2486M–AVR–12/03