295
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
26.8.17
Atmel ATmega1284/ATmega1284P Boot Loader parameters
Note:
Note:
Note:
1. Z0: should be zero for all SPM commands, byte select for the (E)LPM instruction.
Programming.
Table 26-16. Boot size configuration
BOOTSZ1
BOOTSZ0
Boot size
Pages
Application
flash section
Boot loader
flash section
End application
section
Boot reset
address
(start boot
loader section)
1
512 words
4
0x0000 - 0xFDFF
0xFE00 - 0xFFFF
0xFDFF
0xFE00
1
0
1024 words
8
0x0000 - 0xFBFF
0xFC00 - 0xFFFF
0xFBFF
0xFC00
0
1
2048 words
16
0x0000 - 0xF7FF
0xF800 - 0xFFFF
0xF7FF
0xF800
0
4096 words
32
0x0000 - 0xEFFF
0xF000 - 0xFFFF
0xEFFF
0xF000
Table 26-17. Read-While-Write limit
Section
Pages
Address
Read-While-Write section (RWW)
480
0x0000 - 0xEFFF
No Read-While-Write section (NRWW)
32
0xF000 - 0xFFFF
Variable
Corresponding
Z-value
PCMSB
15
Most significant bit in the Program Counter. (The Program Counter is 16 bits
PC[15:0])
PAGEMSB
6
Most significant bit which is used to address the words within one page (128
words in a page requires seven bits PC [6:0]).
ZPCMSB
Z16
Bit in Z-pointer that is mapped to PCMSB. Because Z0 is not used, the ZPCMSB
equals PCMSB + 1.
ZPAGEMSB
Z7
Bit in Z-pointer that is mapped to PCMSB. Because Z0 is not used, the
ZPAGEMSB equals PAGEMSB + 1.
PCPAGE
PC[15:7]
Z16:Z8
Program Counter page address: Page select, for Page Erase and Page Write
PCWORD
PC[6:0]
Z7:Z1
Program Counter word address: Word select, for filling temporary buffer (must be
zero during Page Write operation)