ATMEGA48V_11 ATMEL [ATMEL Corporation], ATMEGA48V_11 Datasheet - Page 281

• Manufacturer Part Number: ATMEGA48V_11
• Description: 8-bit Atmel Microcontroller with 4/8/16K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

27.8.13
2545T–AVR–05/11
Atmel ATmega88 boot loader parameters
In
ming are given.
Table 27-6.
Note:
Table 27-7.
For details about these two section, see
and
Table 27-8.
Note:
BOOTSZ1
Section
Read-while-write section (RWW)
No read-while-write section (NRWW)
Variable
PCMSB
PAGEMSB
ZPCMSB
ZPAGEMSB
PCPAGE
PCWORD
Table 27-6
“RWW – Read-while-write section” on page 270
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
ping to the Z-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
27-8, 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 270
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 27-3 on page 275
Boot
loader
flash
section
0xF80 -
0xFFF
0xF00 -
0xFFF
0xE00 -
0xFFF
0xC00 -
0xFFF
Figure 27-2 on page
ATmega48/88/168
Address
0x000 - 0xBFF
0xC00 - 0xFFF
End
application
section
0xF7F
0xEFF
0xDFF
0xBFF
272.
and the map-
Boot reset
address (start
boot loader
section)
0xF80
0xF00
0xE00
0xC00
281