ATmega48PA Automotive Atmel Corporation, ATmega48PA Automotive Datasheet - Page 290

• Manufacturer Part Number: ATmega48PA Automotive
• Manufacturer: Atmel Corporation

27.8.14
Table 27-7.
Table 27-8.
Table 27-9.
290
BOOTSZ1
Section
Read-While-Write section (RWW)
No Read-While-Write section (NRWW)
Variable
PCMSB
PAGEMSB
ZPCMSB
ZPAGEMSB
PCPAGE
PCWORD
Note:
1
1
0
0
1. Z15:Z13: always ignored
Atmel ATmega48PA/88PA/168PA [Preliminary]
Atmel ATmega88PA Boot Loader Parameters
BOOTSZ0
Z0: should be zero for all SPM commands, byte select for the LPM instruction.
See
Self-Programming.
Boot Size Configuration, Atmel ATmega88PA
Read-While-Write Limit, Atmel ATmega88PA
Explanation of Different Variables used in
ATmega88PA
“Addressing the Flash During Self-Programming” on page 282
1
0
1
0
Boot
Size
128 words
256 words
512 words
1024 words
PC[11:5]
PC[4:0]
11
4
In
ming are given.
Note:
For details about these two section, see
278
Table 27-7
and
Pages
The different BOOTSZ Fuse configurations are shown in
“RWW – Read-While-Write Section” on page
16
32
4
8
Corresponding
through
Application
Flash
Section
0x000 - 0xF7F
0x000 - 0xEFF
0x000 - 0xDFF
0x000 - 0xBFF
Z-value
Z12:Z6
Z5:Z1
Z12
Z5
(1)
Table
Figure 27-3
27-9, the parameters used in the description of the self program-
Boot
Loader
Flash
Section
0xF80 - 0xFFF
0xF00 - 0xFFF
0xE00 - 0xFFF
0xC00 - 0xFFF
Description
Most significant bit in the Program Counter. (The Program Counter is
12 bits PC[11:0])
Most significant bit which is used to address the words within one page
(32 words in a page requires 5 bits PC [4:0]).
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.
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)
Pages
96
32
and the Mapping to the Z-pointer, Atmel
“NRWW – No Read-While-Write Section” on page
for details about the use of Z-pointer during
End
Application
Section
0xF7F
0xEFF
0xDFF
0xBFF
Address
0x000 - 0xBFF
0xC00 - 0xFFF
278.
Boot Reset Address (Start Boot Loader
Section)
0xF80
0xF00
0xE00
0xC00
Figure 27-2 on page
280.
9223B–AVR–09/11