Atmel ATmega32M1 User Manual

293
7647H–AVR–03/12
Atmel ATmega16/32/64/M1/C1
Note: Z15:Z13: always ignored
Z0: should be zero for all SPM commands, byte select for the LPM instruction.
See “Addressing the Flash During Self-Programming” on page 285 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 24-7 through Table 24-9, the parameters used in the description of the self program-
ming are given.
Note: 1. The different BOOTSZ Fuse configurations are shown in Figure 24-2.
2. 1 word equals 2 bytes.
For details about these two section, see “NRWW – No Read-While-Write Section” on page 280
and “RWW – Read-While-Write Section” on page 280.
Table 24-9. Explanation of Different Variables used in Figure 24-3 and the Mapping to the
Z-pointer
Variable
Corresponding
Z-value
(Note:)
Description
PCMSB 12
Most significant bit in the Program Counter. (The Program
Counter is 13 bits PC[2:0])
PAGE MSB 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]).
ZPCMSB Z13
Bit in Z-register that is mapped to PCMSB. Because Z0 is
not used, the ZPCMSB equals PCMSB + 1.
ZPAGEMSB Z6
Bit in Z-register that is mapped to PAGEMSB. Because Z0 is
not used, the ZPAGEMSB equals PAGEMSB + 1.
PCPAGE PC[12:6] Z13:Z7
Program counter page address: Page select, for page erase
and page write
PCWORD PC[5:0] Z6:Z1
Program counter word address: Word select, for filling
temporary buffer (must be zero during page write operation)
Table 24-10. Boot Size Configuration, ATmega16/32/64/M1/C1 (32K product)
BOOTSZ1 BOOTSZ0
Boot
Size
(2)
Pages
Application
Flash
Section
Boot
Loader
Flash
Section
End
Application
Section
Boot Reset
Address
(Start Boot
Loader
Section)
11
256
words
4
0x0000 -
0x3EFF
0x3F00 -
0x3FFF
0x3EFF 0x3F00
10
512
words
8
0x0000 -
0x3DFF
0x3E00 -
0x3FFF
0x3DFF 0x3E00
01
1024
words
16
0x0000 -
0x3BFF
0x3C00 -
0x3FFF
0x3BFF 0x3C00
00
2048
words
32
0x0000 -
0x37FF
0x3800 -
0x3FFF
0x37FF 0x3800
Table 24-11. Read-While-Write Limit
Section Pages Address
Read-While-Write section (RWW) 224 0x0000 - 0x37FF
No Read-While-Write section (NRWW) 32 0x3800 - 0x3FFF

Atmel ATmega32M1 Specifications

General

Brand	Atmel
Model	ATmega32M1
Category	Microcontrollers
Language	English