Table 24-8. Read-while-write Limit
Section
Pages
96
Address
Read-while-write section (RWW)
No Read-while-write section (NRWW)
0x0000 - 0x17FF
0x1800 - 0x1FFF
32
For details about these two section, see Section 24.3.2 “NRWW – No Read-while-write Section” on page 242 and Section
24.3.1 “RWW – Read-while-write Section” on page 242.
Table 24-9. Explanation of Different Variables used in Figure 24-3 and the Mapping to the Z-pointer
Corresponding
Variable
Z-value(1)
Description
Most significant bit in the program counter (the program counter
is 13 bits PC[2:0]).
PCMSB
12
5
Most significant bit which is used to address the words within
one page (64 words in a page requires 6 bits PC [5:0]).
PAGEMSB
ZPCMSB
Bit in Z-register that is mapped to PCMSB. Because Z0 is not
used, the ZPCMSB equals PCMSB + 1.
Z13
Z6
Bit in Z-register that is mapped to PAGEMSB. Because Z0 is
not used, the ZPAGEMSB equals PAGEMSB + 1.
ZPAGEMSB
PCPAGE
Program counter page address: Page select, for page erase
and page write
PC[12:6]
PC[5:0]
Z13:Z7
Z6:Z1
Program counter word address: Word select, for filling
temporary buffer (must be zero during page write operation)
PCWORD
Note:
1. Z15:Z13: always ignored
Z0: should be zero for all SPM commands, byte select for the LPM instruction.
See Section 24.6 “Addressing the Flash during Self-Programming” on page 246 for details about the use of
Z-pointer during self-programming.
24.7.15 ATmega16/32/64/M1/C1 - 32K -Flash Boot Loader Parameters
In Table 24-10 through Table 24-12 on page 253, the parameters used in the description of the self programming are given.
Table 24-10. Boot Size Configuration, ATmega16/32/64/M1/C1 (32K product)
Boot
Loader
Flash
Boot Reset
Address (Start
Boot Loader
Section)
Application
Flash
Section
End
Application
Section
Boot
BOOTSZ1
BOOTSZ0
Size(2)
Pages
Section
256
words
0x0000 -
0x3EFF
0x3F00 -
0x3FFF
1
1
4
0x3EFF
0x3DFF
0x3BFF
0x37FF
0x3F00
0x3E00
0x3C00
0x3800
512
words
0x0000 -
0x3DFF
0x3E00 -
0x3FFF
1
0
0
0
1
0
8
1024
words
0x0000 -
0x3BFF
0x3C00 -
0x3FFF
16
32
2048
words
0x3800 -
0x3FFF
0x0000 - 0x37FF
Notes: 1. The different BOOTSZ Fuse configurations are shown in Figure 24-2 on page 243.
2. 1 word equals 2 bytes.
252
ATmega16/32/64/M1/C1 [DATASHEET]
7647O–AVR–01/15
MICROCHIP [ MICROCHIP ]
