ATMEGA2561V ATMEL [ATMEL Corporation], ATMEGA2561V Datasheet - Page 335

• Manufacturer Part Number: ATMEGA2561V
• Description: 8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

ATmega640 Boot Loader
Parameters
2549K–AVR–01/07
In Table 140 through Table 142, the parameters used in the description of the Self-Pro-
gramming are given.
Table 140. Boot Size Configuration, ATmega640
Note:
Table 141. Read-While-Write Limit, ATmega640
Note:
Table 142. Explanation of different variables used in Figure 137 and the mapping to the
Z-pointer, ATmega640
Section
Read-While-Write section (RWW)
No Read-While-Write section (NRWW)
Variable
PCMSB
1
1
0
0
1. The different BOOTSZ Fuse configurations are shown in Figure 136.
1. For details about these two section, see “NRWW – No Read-While-Write Section” on
(1)
page 324 and “RWW – Read-While-Write Section” on page 324.
1
0
1
0
14
words
words
words
words
1024
2048
4096
512
ATmega640/1280/1281/2560/2561
16
32
Corresponding
4
8
Z-value
0x0000 -
0x7DFF
0x0000 -
0x7BFF
0x0000 -
0x77FF
0x0000 -
0x6FFF
(2)
Description
Most significant bit in the Program
Counter. (The Program Counter is 15 bits
PC[14:0])
(1)
0x7E00 -
0x7FFF
0x7C00 -
0x7FFF
0x7800 -
0x7FFF
0x7000 -
0x7FFF
Pages
224
32
(1)
0x7DFF
0x7BFF
0x77FF
0x6FFF
Address
0x0000 - 0x6FFF
0x7000 - 0x7FFF
0x7E00
0x7C00
0x7800
0x7000
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