ATMEGA644PV ATMEL [ATMEL Corporation], ATMEGA644PV Datasheet - Page 286

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

24.8.14
In
Table 24-7.
Note:
Table 24-8.
Note:
Table 24-9.
Note:
See
Programming.
286
BOOTSZ1
Section
Read-While-Write section (RWW)
No Read-While-Write section (NRWW)
Variable
PCMSB
PAGEMSB
ZPCMSB
ZPAGEMSB
PCPAGE
PCWORD
Table 24-7
”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
ATmega164P Boot Loader Parameters
Write Section” on page
through
BOOTSZ0
Boot Size Configuration
Read-While-Write Limit
Explanation of different variables used in
1
0
1
0
PC[12:6]
PC[5:0]
12
Table
5
Boot Size
1024 words
128 words
256 words
512 words
24-9, the parameters used in the description of the Self-Programming are given.
Corresponding
275.
Z-value
Z14:Z7
Z6:Z1
Z13
Z6
(1)
(1)
Pages
16
2
4
8
”NRWW – No Read-While-Write Section” on page 275
Description
Most significant bit in the Program Counter. (The Program Counter is 13 bits
PC[12:0])
Most significant bit which is used to address the words within one page (128
words in a page requires seven bits PC [5:0]).
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)
0x0000 - 0x1F7F
0x0000 - 0x1EFF
Application
Flash Section
0x0000 - 0x1DFF
0x0000 - 0x1BFF
Figure 24-3 on page 279
(1)
Figure 24-2 on page
Pages
112
16
Boot Loader
Flash Section
0x1F80 - 0x1FFF
0x1F00 - 0x1FFF
0x1E00 - 0x1FFF
0x1C00 - 0x1FFF
for details about the use of Z-pointer during Self-
277.
and the mapping to the Z-pointer
End
Application
Section
0x1F7F
0x1EFF
0x1DFF
0x1BFF
Address
0x0000 - 0x1BFF
0x1C00 - 0x7FFF
and
”RWW – Read-While-
Boot Reset
Address
(Start Boot
Loader Section)
0x1F80
0x1F00
0x1E00
0x1C00
8011D–AVR–02/07