ATMEGA644PV ATMEL [ATMEL Corporation], ATMEGA644PV Datasheet - Page 288

• Manufacturer Part Number: ATMEGA644PV
• Description: 8-bit Microcontroller with 16/32/64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

24.8.16
In
Table 24-13. Boot Size Configuration
Note:
Table 24-14. Read-While-Write Limit
Note:
Table 24-15.
Note:
See
Programming.
288
BOOTSZ1
Section
Read-While-Write section (RWW)
No Read-While-Write section (NRWW)
Variable
PCMSB
PAGEMSB
ZPCMSB
ZPAGEMSB
PCPAGE
PCWORD
Table 24-13
”Addressing the Flash During Self-Programming” on page 279
1
1
0
0
1. The different BOOTSZ Fuse configurations are shown in
1. For details about these two section, see
1. Z0: should be zero for all SPM commands, byte select for the (E)LPM instruction.
ATmega164P/324P/644P
ATmega644P Boot Loader Parameters
Write Section” on page
BOOTSZ0
Explanation of different variables used in
through
1
0
1
0
PC[14:7]
PC[6:0]
14
7
Table
Boot Size
1024 words
2048 words
4096 words
512 words
24-15, the parameters used in the description of the Self-Programming are given.
275.
Correspondi
Z-value
Z15:Z7
Z7:Z1
Z15
(1)
ng
Z8
(1)
Pages
16
32
4
8
”NRWW – No Read-While-Write Section” on page 275
Application
Flash Section
0x0000 - 0x7DFF
0x0000 - 0x7BFF
0x0000 - 0x77FF
0x0000 - 0x6FFF
Description
Most significant bit in the Program Counter. (The Program Counter is 15 bits
PC[14:0])
Most significant bit which is used to address the words within one page (128
words in a page requires seven bits PC [6:0]).
Bit in Z-pointer that is mapped to PCMSB. Because Z0 is not used, the ZPCMSB
equals PCMSB + 1.
Bit in Z-pointer that is mapped to PCMSB. Because Z0 is not used, the
ZPAGEMSB equals PAGEMSB + 1.
Program Counter page address: Page select, for Page Erase and Page Write
Program Counter word address: Word select, for filling temporary buffer (must be
zero during Page Write operation)
Figure 24-3 on page 279
(1)
Figure 24-2 on page
Pages
224
32
Boot Loader
Flash Section
0x7E00 - 0x7FFF
0x7C00 - 0x7FFF
0x7800 - 0x7FFF
0x7000 - 0x7FFF
for details about the use of Z-pointer during Self-
277.
and the mapping to the Z-pointer
End Application
Section
0x7DFF
0x7BFF
0x77FF
0x6FFF
Address
0x0000 - 0xEFFF
0xF000 - 0xFFFF
and
”RWW – Read-While-
Boot Reset
Address
(Start Boot
Loader Section)
0x7E00
0x7C00
0x7800
0x7000
8011D–AVR–02/07