ATMEGA2561V ATMEL [ATMEL Corporation], ATMEGA2561V Datasheet - Page 336

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

ATmega1280/1281 Boot
Loader Parameters
336
ATmega640/1280/1281/2560/2561
Table 142. Explanation of different variables used in Figure 137 and the mapping to the
Z-pointer, ATmega640
Notes:
In Table 143 through Table 144, the parameters used in the description of the Self-Pro-
gramming are given.
Table 143. Boot Size Configuration, ATmega1280/1281
Note:
Variable
PAGEMSB
ZPCMSB
ZPAGEMS
B
PCPAGE
PCWORD
1
1
0
0
1. Z0: should be zero for all SPM commands, byte select for the (E)LPM instruction.
2. See “Addressing the Flash During Self-Programming” on page 328 for details about
1. The different BOOTSZ Fuse configurations are shown in Figure 136.
the use of Z-pointer during Self-Programming.
1
0
1
0
PC[14:7]
PC[6:0]
words
words
words
words
6
1024
2048
4096
512
16
32
Corresponding
4
8
Z-value
Z15:Z8
Z7:Z1
Z15
Z7
0x0000 -
0xFDFF
0x0000 -
0xFBFF
0x0000 -
0xF7FF
0x0000 -
0xEFFF
(2)
Description
Most significant bit which is used to
address the words within one page (128
words in a page requires seven bits PC
[6:0]).
Bit in Z-pointer that is mapped to PCMSB.
Because Z0 is not used, the ZPCMSB
equals PCMSB + 1.
Bit in Z-pointer that is mapped to PCMSB.
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)
0xFE00 -
0xFFFF
0xFC00 -
0xFFFF
0xF800 -
0xFFFF
0xF000 -
0xFFFF
(1)
(1)
0xFDFF
0xFBFF
0xF7FF
0xEFFF
2549K–AVR–01/07
0xFE00
0xFC00
0xF800
0xF000