ATMEGA48V_09 ATMEL [ATMEL Corporation], ATMEGA48V_09 Datasheet - Page 280

• Manufacturer Part Number: ATMEGA48V_09
• Description: 8-bit Microcontroller with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

26.8.13
280
ATmega48/88/168
ATmega88 Boot Loader Parameters
In
ming are given.
Table 26-6.
Note:
Table 26-7.
For details about these two section, see
and
Table 26-8.
Note:
BOOTSZ1
Section
Read-While-Write section (RWW)
No Read-While-Write section (NRWW)
Variable
PCMSB
PAGEMSB
ZPCMSB
ZPAGEMSB
PCPAGE
PCWORD
Table 26-6
“RWW – Read-While-Write Section” on page 269
1
1
0
0
The different BOOTSZ Fuse configurations are shown in
1. Z15:Z13: always ignored
Z0: should be zero for all SPM commands, byte select for the LPM instruction.
BOOTSZ0
through
Boot Size Configuration, ATmega88
Read-While-Write Limit, ATmega88
Explanation of Different Variables used in
pointer, ATmega88
PC[11:5]
PC[4:0]
1
0
1
0
11
4
Table
Boot
Size
128
words
256
words
512
words
1024
words
Corresponding
26-8, the parameters used in the description of the self program-
Z-value
Z12:Z6
Z5:Z1
Pages
Z12
Z5
16
32
4
8
(1)
“NRWW – No Read-While-Write Section” on page 269
Application
Flash
Section
0x000 -
0xF7F
0x000 -
0xEFF
0x000 -
0xDFF
0x000 -
0xBFF
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
Figure 26-3
Boot
Loader
Flash
Section
0xF80 -
0xFFF
0xF00 -
0xFFF
0xE00 -
0xFFF
0xC00 -
0xFFF
Figure
Address
0x000 - 0xBFF
0xC00 - 0xFFF
26-2.
End
Application
Section
0xF7F
0xEFF
0xDFF
0xBFF
and the Mapping to the Z-
2545R–AVR–07/09
Boot Reset
Address
(Start Boot
Loader
Section)
0xF80
0xF00
0xC00
0xE00