ATmega32(L)
ATmega32 Boot Loader
Parameters
In Table 99 through Table 101, the parameters used in the description of the self pro-
gramming are given.
Table 99. Boot Size Configuration(1)
Boot Reset
Boot
Loader
Flash
Address
(start Boot
Loader
Application
Flash
Section
End
Application
section
Boot
Size
BOOTSZ1
BOOTSZ0
Pages
Section
Section)
256
words
$0000 -
$3EFF
$3F00 -
$3FFF
1
1
4
$3EFF
$3DFF
$3BFF
$37FF
$3F00
$3E00
$3C00
$3800
512
words
$0000 -
$3DFF
$3E00 -
$3FFF
1
0
0
0
1
0
8
1024
words
$0000 -
$3BFF
$3C00 -
$3FFF
16
32
2048
words
$0000 -
$37FF
$3800 -
$3FFF
Note:
1. The different BOOTSZ Fuse configurations are shown in Figure 125
Table 100. Read-While-Write Limit(1)
Section
Pages
224
Address
Read-While-Write section (RWW)
No Read-While-Write section (NRWW)
$0000 - $37FF
$3800 - $3FFF
32
Note:
1. For details about these two section, see “NRWW – No Read-While-Write Section” on
page 245 and “RWW – Read-While-Write Section” on page 245
Table 101. Explanation of Different Variables used in Figure 126 and the Mapping to
the Z-pointer
Corresponding
Variable
Z-value(1)
Description
13
5
Most significant bit in the Program Counter.
(The Program Counter is 14 bits PC[13:0])
PCMSB
Most significant bit which is used to address the
words within one page (64 words in a page
requires 6 bits PC [5:0]).
PAGEMSB
ZPCMSB
Z14
Z6
Bit in Z-register that is mapped to PCMSB.
Because Z0 is not used, the ZPCMSB equals
PCMSB + 1.
Bit in Z-register that is mapped to PAGEMSB.
Because Z0 is not used, the ZPAGEMSB
equals PAGEMSB + 1.
ZPAGEMSB
PCPAGE
PC[13:6]
PC[5:0]
Z14:Z7
Z6:Z1
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)
PCWORD
Note:
1. Z15: always ignored
Z0: should be zero for all SPM commands, byte select for the LPM instruction.
See “Addressing the Flash during Self-Programming” on page 249 for details about
the use of Z-pointer during Self-Programming.
255
2503J–AVR–10/06
ATMEL [ ATMEL ]
