Atmel ATmega328P Xplained Mini MEGA328P-XMINI MEGA328P-XMINI Data Sheet
Product codes
MEGA328P-XMINI
278
ATmega48A/PA/88A/PA/168A/PA/328/P [DATASHEET]
Atmel-8271H-AVR- ATmega-Datasheet_08/2014
27.8.16 ATmega328 and ATmega328P Boot Loader Parameters
In
, the parameters used in the description of the self programming are given.
Note:
The different BOOTSZ Fuse configurations are shown in
For details about these two section, see
Note:
1. Z15: always ignored
Z0: should be zero for all SPM commands, byte select for the LPM instruction.
See
See
for details about the use of Z-pointer during Self-
Programming.
Table 27-13.
Boot Size Configuration, ATmega328/328P
BOOTSZ1
BOOTSZ0
Boot
Size
Size
Pages
Application
Flash
Section
Flash
Section
Boot
Loader
Flash
Section
Loader
Flash
Section
End
Application
Section
Application
Section
Boot Reset Address (Start Boot
Loader Section)
Loader Section)
1
1
256 words
4
0x0000 - 0x3EFF
0x3F00 - 0x3FFF
0x3EFF
0x3F00
1
0
512 words
8
0x0000 - 0x3DFF
0x3E00 - 0x3FFF
0x3DFF
0x3E00
0
1
1024 words
16
0x0000 - 0x3BFF
0x3C00 - 0x3FFF
0x3BFF
0x3C00
0
0
2048 words
32
0x0000 - 0x37FF
0x3800 - 0x3FFF
0x37FF
0x3800
Table 27-14.
Read-While-Write Limit, ATmega328/328P
Section
Pages
Address
Read-While-Write section (RWW)
224
0x0000 - 0x37FF
No Read-While-Write section (NRWW)
32
0x3800 - 0x3FFF
Table 27-15.
and the Mapping to the Z-pointer, ATmega328/328P
Variable
Corresponding
Z-value
Description
PCMSB
13
Most significant bit in the Program Counter. (The Program Counter
is 14 bits PC[13:0])
is 14 bits PC[13:0])
PAGEMSB
5
Most significant bit which is used to address the words within
one page (64 words in a page requires 6 bits PC [5:0])
one page (64 words in a page requires 6 bits PC [5:0])
ZPCMSB
Z14
Bit in Z-register that is mapped to PCMSB. Because Z0 is not used,
the ZPCMSB equals PCMSB + 1.
the ZPCMSB equals PCMSB + 1.
ZPAGEMSB
Z6
Bit in Z-register that is mapped to PAGEMSB. Because Z0 is not
used, the ZPAGEMSB equals PAGEMSB + 1.
used, the ZPAGEMSB equals PAGEMSB + 1.
PCPAGE
PC[13:6]
Z14:Z7
Program counter page address: Page select, for page erase and
page write
page write
PCWORD
PC[5:0]
Z6:Z1
Program counter word address: Word select, for filling temporary
buffer (must be zero during page write operation)
buffer (must be zero during page write operation)